THS8135
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SLAS343B – MAY 2001 – REVISED APRIL 2013
10-BIT 240-MSPS VIDEO DAC
WITH TRI-LEVEL SYNC AND VIDEO (ITU-R.BT601)-COMPLIANT FULL-SCALE RANGE
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FEATURES
1
•
•
•
2
•
•
•
Triple 10-Bit D/A Converters
240-MSPS Operation
YPbPr/RGB Configurable Blanking Levels,
Correctly Positioned for Either Full (0-1023) or
Video (ITU-R.BT601) Compliant Input Code
Ranges
Generic Triple DAC Mode for Non-Video
Applications
Direct Drive of Double-Terminated 75-Ω Load
Into Standard Video Levels
3x10 Bit 4:4:4, 2x10 Bit 4:2:2 or 1x10 Bit 4:2:2
(ITU-R.BT656) Multiplexed YCbCr/GBR Input
Data Formats
•
•
•
•
Bi-Level (EIA) or Tri-Level (SMPTE) Sync
Generation
Integrated Sync-On-Green/Luminance or SyncOn-All Composite Sync Insertion
Internal Voltage Reference
Low-Power Operation From 3.3-V Analog and
1.8-V Digital Suply Levels
APPLICATIONS
•
•
High-Definition Television (HDTV) Set-Top
Boxes/Receivers/Displays
High-Resolution Image Processing
DESCRIPTION
The THS8135 is a general-purpose triple high-speed D/A converter optimized for use in video/graphics
applications. The device operates from 3.3-V analog and 1.8-V digital supplies. The THS8135 performance is
assured at a sampling rate up to 240 MSPS. The THS8135 consists of three 10-bit D/A converters and additional
circuitry for bi-level/tri-level sync and blanking level generation. By providing a dc offset for the lowest video
amplitude output in video DAC mode, the device can insert a (negative) bi-level or (negative/positive) tri-level
sync on either only the green/luminance (sync-on-green/sync-on-Y) channel or on all channels for video
applications. A generic DAC mode avoids this dc offset, making this device suitable for non-video applications as
well.
The THS8135 is a footprint-compatible functional upgrade to the THS8133. In addition, the THS8135 allows a
higher update rate for oversampled video digitizing for all PC graphics formats up to UXGA (1600x1200)
resolution at 85 Hz and all practical digital TV formats including HDTV. The support for oversampling significantly
reduces the complexity of the analog reconstruction filter required behind the DAC.
Standard video levels can be generated for the full 10-bit input code range. Alternatively, the same levels can be
reached from a reduced input code range compliant to the video sampling standard ITU-R.BT-601. In that case,
the full-scale range of the DAC is dependent on the RGB or YCbCr color space configuration of the device.
When configured for RGB operation, full video output swing is reached for input codes 64-940 on all channels.
When configured for YCbCr operation, code range 64-940 on Y and code range 64-960 on Cb and Cr channels
generate full output swing using internal amplitude scaling on these color components. The device provides
headroom to accommodate under-/over-shoot outside the ITU-R.BT601 range to allow the generation of ITUR.BT601 illegal colors or super-black / super-white levels.
A digital control input for insertion of a reference (blanking) level on the analog outputs is included. The
amplitude of the blanking level is configurable for either RGB or YPbPr component outputs and for full or reduced
input code ranges. The inserted sync output amplitude(s) always has the required 7:3 ratio to the full-scale video
amplitude.
The current-steering DACs can be directly terminated in resistive loads to produce voltage outputs. The device
provides a flexible configuration of maximum output current drive. The devices output drivers have been
specifically designed to produce standard video output levels when directly connected to a single-ended doubleterminated 75-Ω coaxial cable.
1
2
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PowerPAD is a trademark of Texas Instruments.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2001–2013, Texas Instruments Incorporated
THS8135
SLAS343B – MAY 2001 – REVISED APRIL 2013
www.ti.com
The input data format can be either 3x10 bit 4:4:4, 2x10 bit 4:2:2, or 1x10 bit 4:2:2. This enables a direct
interface to a wide range of video DSP/ASICs including parts generating ITU-R.BT656 formatted output data.
However, the THS8135 needs specific input synchronization signals to properly insert a composite sync onto its
outputs as it does not extract embedded SAV/EAV synchronization codes from the ITU-R.BT656 input. Along
with other extra functionality, this feature is available on a derivative device (THS8200).
Table 1. Ordering Information (1)
(1)
(2)
TA
PACKAGED DEVICES (2)
TQFP-48 PowerPAD™
0°C to 70°C
THS8135PHP
For the most current package and ordering information, see the Package Option Addendum at the end
of this document, or see the TI web site at www.ti.com.
Package drawings, thermal data, and symbolization are available at www.ti.com/packaging.
M2
M1
AVSS
ABPb
AVDD
ARPr
AVSS
AGY
AVDD
COMP
FSADJ
VREF
PHP PACKAGE
(TOP VIEW)
48 47 46 45 44 43 42 41 40 39 38 37
BCb9
BCb8
BCb7
BCb6
BCb5
BCb4
BCb3
BCb2
BCb1
BCb0
DVSS
DVDD
1
36
2
35
3
34
4
33
5
32
6
31
7
30
8
29
9
28
10
27
11
26
12
25
GY0
GY1
GY2
GY3
GY4
GY5
GY6
GY7
GY8
GY9
CLK
SYNC_T
RCr0
RCr1
RCr2
RCr3
RCr4
RCr5
RCr6
RCr7
RCr8
RCr9
BLANK
SYNC
13 14 15 16 17 18 19 20 21 22 23 24
2
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Functional Block Diagram
DVDD DVSS
COMP FSADJ VREF
Bandgap
Reference
RCr[9:0]
Input
Formatter
GY[9:0]
BCb[9:0]
CLK
M1
M2
R/Cr
Register
DAC
ARPr
G/Y
Register
DAC
AGY
B/Cb
Register
DAC
ABPb
Configuration
Control
SYNC/BLANK
Control
BLANK
SYNC
SYNC_T
AVDD AVSS
Table 2. Terminal Functions
TERMINAL
NAME
NO.
I/O
DESCRIPTION
ABPb
45
O
Analog blue or Pb current output, capable of directly driving a double terminated 75-Ω coaxial cable
AGY
41
O
Analog green or Y current output, capable of directly driving a double terminated 75-Ω coaxial cable
ARPr
43
O
Analog red or Pr current output, capable of directly driving a double terminated 75-Ω coaxial cable
AVDD
40, 44
I
Analog power supply (3.3 V). All AVDD pins must be connected.
AVSS
42, 46
I
Analog ground
10-1
I
Blue or Cb pixel data input. Signals with index 0 denote the least significant bits.
I
Blanking control input, active low. A rising edge on CLK latches BLANK. When asserted, the ARPr,
AGY, and ABPb outputs are driven to the blanking level, irrespective of the value on the data inputs.
SYNC takes precedence over BLANK, so asserting SYNC (low) while BLANK is active (low) results
in sync generation. The amplitude of the DAC outputs during BLANK active are determined by the
color space and input code range configurations of the device. BLANK control is available in both
video and generic DAC modes.
BCb0-BCb9
BLANK
23
CLK
26
I
Clock input. A rising edge on CLK latches RCr0-9, GY0-9, BCb0-9, BLANK, SYNC, and SYNC_T.
In video DAC mode, the M1 and M2 inputs are latched by a rising edge on CLK as well but only
when additional conditions are satisfied as explained in their terminal description. In generic DAC
mode, M1 and M2 are continuously interpreted that is independent of additional conditions, to
determine color space and input data formats. This allows easier configuration.
COMP
39
O
Compensation terminal. A 0.1-µF capacitor must be connected between COMP and AVDD.
DVDD
12
I
Digital power supply (1.8 V)
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Table 2. Terminal Functions (continued)
TERMINAL
NAME
NO.
I/O
DESCRIPTION
DVSS
11
I
Digital ground
FSADJ
38
I
Full-scale adjust control. The full-scale current drive on each of the output channels is determined
by the value of a resistor RFS connected between this terminal and AVSS. Figure 5 shows the
relationship between full-scale output voltage compliance and RFS for the nominal DAC termination
of 37.5 Ω.
36-27
I
Green or Y pixel data input. Signals with index 0 denote the least significant bits.
GY0-GY9
Operation mode control 1.
In video DAC mode, the second rising edge on CLK after a transition on SYNC latches M1. The
interpretation is dependent on the polarity of the last SYNC transition:
SYNC L → H: latched as M1_INT
M1
47
I
SYNC H → L: latched as BLNK_INT
Together with M2_INT, M1_INT configures the device as shown in Table 4 for video DAC mode.
BLNK_INT determines if the device operates with the full- or reduced-scale input code range.
Together with the color space configuration, this sets the amplitude of the blanking level on the
analog output(s) as shown in Table 7.
In generic DAC mode, M1 is continuously interpreted as M1_INT, BLNK_INT control is not available
and the device always assumes full-scale input code range for blank level positioning.
Operation mode control 2.
In video DAC mode, the second rising edge on CLK after a transition on SYNC latches M2. The
interpretation is dependent on the polarity of the last SYNC transition:
SYNC L → H: latched as M2_INT
M2
RCr0-RCr9
SYNC
48
I
SYNC H → L: latched as INS3_INT
Together with M1_INT, M2_INT configures the device as shown in Table 5 for video DAC mode.
When INS3_INT is high, the device inserts sync on all DAC outputs; when low, sync is inserted only
on the AGY output.
In generic DAC mode, M2 is continuously interpreted as M2_INT, INS3_INT control is not
applicable, because sync insertion is not available in generic DAC mode.
13-22
I
Red or Cr pixel data input. Signals with index 0 denote the least significant bits.
I
Sync control input, active low. A rising edge on CLK latches SYNC. When asserted, only the AGY
output (when INS3_INT = L, see terminal M2) for sync-on-G/Y, or ARPr, AGY, and ABPb outputs
(when INS3_INT = H, see terminal M2) for sync-on-all, are driven to the sync level, irrespective of
the values on the data or BLANK inputs. Therefore, SYNC should remain low for the whole duration
of sync, which is in the case of a tri-level sync both the negative and positive portion. See Figure 10
for timing control. SYNC control is only available in video DAC mode.
24
SYNC_T
25
I
Sync tri-level control, active high. A rising edge on CLK latches SYNC_T. When asserted (high), a
positive sync (higher than blanking level) is generated when SYNC is low. When disabled (low), a
negative sync (lower than blanking level) is generated when SYNC is low. When generating a trilevel (negative-to-positive) sync, an L->H transition on this signal positions the start of the positive
transition. Figure 10 for timing control.
SYNC_T is also used to put the device in generic DAC mode: SYNC = H AND SYNC_T = H →
generic DAC mode. Therefore, the user should always drive SYNC_T low outside the sync period
when video DAC mode operation is intended.
VREF
37
O
Voltage reference for DACs. An internal voltage reference of nominally 1.2 V is provided, which
requires an external 0.1-µF ceramic capacitor between VREF and AVSS.
4
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DETAILED DESCRIPTION
The THS8135 is a fast well-matched triple DAC with current outputs optimized for video applications without
sacrificing its usefulness as a general-purpose triple DAC, thanks to a generic DAC mode. For video
applications, the device can embed an analog output (composite) bi-level or tri-level sync on only the green/luma
channel or on all three DAC output channels. The THS8135 offers compatibility with several popular video data
formats and provides standard analog output compliance levels for component video digitized according to the
ITU-R.BT601 sampling standard. The DAC full-scale range is also adjustable.
Sync Generation
The SYNC and SYNC_T control inputs enable the superposition of an additional current onto the AGY channel or
onto all three channels, depending on the setting of INS3_INT. Using a combination of the SYNC and SYNC_T
control inputs, either bi-level negative going pulses or tri-level pulses can be generated. By driving these
terminals with the correct timing inputs, the user can insert onto the analog output(s) any composite sync format
consisting of horizontal sync, vertical sync, pre- and post-serration, and equalization pulses. Assertion of SYNC
(active low) identifies the sync period, while assertion of SYNC_T (active high) within this period identifies the
positive excursion of a tri-level sync.
Blanking Generation
The BLANK control input fixes the output amplitude on all channels to the blanking level, irrespective of the value
on the data input ports. The position of the blanking level on each channel and its relation to active video is
different depending on the RGB versus YCbCr color space configuration: bottom-range blanking level for R, G,
B, and Y outputs versus mid-range blanking level for Pb and Pr outputs. This also depends on the full-scale
versus reduced-scale (ITU-R.BT601) input code range configuration: bottom-range blanking levels correspond to
input code 0 when in full-scale, or to code 64 when in reduced-scale input code range configuration; mid-range
blanking levels remain at 512 in all cases.
Generic DAC Mode vs Video DAC Mode
In video DAC mode, the device provides additional dc bias on R, G, B, and Y channels to provide headroom for
negative sync insertion, as shown on Figure 1 and Figure 3.
Such bias might be undesirable in applications where no sync embedding is needed, because it causes
additional power consumption and might prevent dc coupling of the DAC outputs. In such cases, only a triple
DAC operation without dc bias (that is, DAC input code 0 corresponding to 0-V output) might be preferred as
there is no need for sync insertion. Therefore, the THS8135 includes a generic DAC mode that does not add any
dc bias. Sync insertion is not supported in generic DAC mode. Also, in this mode, only full-scale operation is
available. Other features are still available in generic DAC mode: different input data formats, RGB versus YCbCr
color space selection, and blanking level override option.
Because of the eliminated dc bias, the DAC output compliance for full-range video input can be higher in generic
DAC mode: up to 1.286 Vpp at nominal double 75-Ω termination load. This is high enough for the D/A conversion
of composite video (NTSC/PAL/SECAM), where the signal fed to the device contains the complete digital
composite waveform, including sync and color-burst.
Selection between generic DAC versus video DAC mode is controlled through a combination of SYNC and
SYNC_T settings. Because SYNC_T only determines the sync polarity in video DAC mode, this signal has don’t
care status when no sync insertion takes place that is, when SYNC is high. The THS8135 uses the logic level on
the SYNC_T input when SYNC is high to enter generic DAC mode: SYNC_T and SYNC are high → generic DAC
mode. Therefore, the user must make sure to keep SYNC_T low outside the sync insertion period (when SYNC
is high) to prevent entering generic DAC mode, when he intends to use the device in video DAC mode.
Table 3 shows how to select between video DAC and generic DAC mode.
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Table 3. Video vs Generic Mode Selection
SYNC
BLANK
SYNC_T
1
1
1
Generic DAC mode. Blanking override inactive.
OPERATION MODE AND DAC OUTPUT
1
0
1
Generic DAC mode. Blanking override active. Blanking level position is according to the codes of
Table 7, however no dc bias is present on the Y, R, G, and B outputs
1
1
0
Video DAC mode. Blanking override inactive
1
0
0
Video DAC mode. Blanking override active. Blanking level position is according to the codes of
Table 7, with dc bias present on the Y, R, G, and B outputs as shown in Figure 1 and Figure 3.
0
X
0
Video DAC mode. Negative sync inserted.
0
X
1
Video DAC mode. Positive sync inserted.
Device Configuration Using M1 and M2 in Video DAC Mode
In the video DAC mode, the configuration signals M1 and M2 are both sampled on the second rising edge of the
CLK input signal after a L → H or H → L transition on SYNC. Depending on the polarity of this last transition on
SYNC, M1 and M2 are interpreted differently by the THS8135, as shown in Table 4.
NOTE
In the THS8133, only M2 is a sampled signal while M1 is continuously interpreted. By
doing so here, the additional input control signal BLNK_INT is generated. See the
backward compatibility with the THS8133 section.
Table 4. Interpretation of M1 in Video DAC Mode
IF LAST EVENT ON
SYNC IS:
THEN M1 IS
INTERPRETED ON
THE SECOND CLK
RISING EDGE
FOLLOWING THIS
EVENT AS:
H→L
BLNK_INT
L→H
M1_INT
DESCRIPTION
Sets operation with full or video (ITU-R.BT601) - input code range that is, the full-scale
range is reached from either the 0-1023 10-bit input code range or the input code range of
Table 8, see also Table 7 for blanking level positions.
Sets device operation mode. See Table 6 and Table 7.
Table 5. Interpretation of M2 in VIdeo DAC Mode
IF LAST EVENT ON
SYNC IS:
THEN M2 IS
INTERPRETED ON
THE SECOND CLK
RISING EDGE
FOLLOWING THIS
EVENT AS:
DESCRIPTION
H→L
INS3_INT
Sets sync Insertion mode: SYNC low enables sync generation on one (INS3_INT = L) or all
three (INS3_INT = H) DAC outputs. SYNC_T determines the sync polarity.
L→H
M2_INT
Sets device operation mode. See Table 6 and Table 7.
Device Configuration Using M1 and M2 in Generic DAC Mode
To simplify device configuration in the generic DAC mode, the M1 and M2 configuration pins are continuously
interpreted as M1_INT and M2_INT respectively, that is, their interpretation is not dependent on the last event on
SYNC and is not only sampled on the second rising CLK edge after a transition on SYNC. BLNK_INT and
INS3_INT controls are not available in generic mode. As a result, in generic DAC mode, the device always
operates with full-scale input range and no sync insertion is available.
M1_INT and M2_INT can be tied high or low externally to determine the input formatter setting and color space
for blank level positions. Blanking override is still available in generic DAC mode using the BLANK input. Generic
DAC mode only disables the dc bias for R, G, B, and Y component outputs.
Table 3 shows all combinations of these control signals. Note that when SYNC is low, it takes precedence over
BLANK.
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Selection of Color Space and Input Formatter Configuration (Available in Video DAC and
Generic DAC Modes)
Input data to the device can be supplied from a 3x10b GBR or YCbCr input port. If the device is configured to
take data from all three channels, the data is clocked in at each rising edge of CLK. All three DACs operate at
the full clock speed of CLK.
In the case of 4:2:2 sampled data (for YCbCr data), the device can be fed over either a 2x10 bit or 1x10 bit
multiplexed input port. An internal demultiplexer routes the input samples to the appropriate DAC: Y at the rate of
CLK, Cb and Cr each at rate of 1/2 CLK.
According to ITU-R.BT-656, the sample sequence is Cb-Y-Cr-Y over a 1x10-bit interface (Y-port). The sample
sequence starts at the first rising edge of CLK after BLANK has been taken high (inactive). Note that in this case
the frequency of CLK is 2x the Y conversion speed and 4x the conversion speed of both Cr and Cb.
In the case of a 2x10 bit input interface, both the Y-port and the Cr-port are sampled on every CLK rising edge.
The Cr-port carries the sample sequence Cb-Cr. The sample sequence starts at the first rising edge of CLK after
BLANK has been taken high (inactive). Note that in this case the frequency of CLK is equal to the conversion
speed of Y and 2x the conversion speed of both Cr and Cb.
Table 6 shows the possible configurations of the input formatter, as determined by the internal M1_INT and
M2_INT signals. The color space selection also determines the position of the blanking level and is explained in
the next section.
Table 6. THS8135 RGB/YCbCr Color Space and Input Formatter Configuration
M1_INT
M2_INT
CONFIGURATION
DESRIPTION
GBR mode 4:4:4. Data clocked in on each rising edge of CLK from G, B, and R
input channels.
L
L
GBR 3x10b-4:4:4
L
H
YCbCr 3x10b-4:4:4
YCbCr mode 4:4:4. Data clocked in on each rising edge of CLK from Y, Cb, and Cr
input channels.
H
L
YCbCr 2x10b-4:2:2
YCbCr mode 4:2:2 2x10 bit. Data clocked in on each rising edge of CLK from Y
channel. A sample sequence of Cb-Cr should be applied to the Cr port. At the first
rising edge of CLK after BLANK is taken high, Cb should be present on this port.
H
H
YCbCr 1x10b-4:2:2
YCbCr mode 4:2:2 1x10 bit (ITU-R.BT-656 compliant). Data clocked in on each
rising edge of CLK from Y channel. A sample sequence of Cb-Y-Cr-Y should be
applied to the Y port. At the first rising edge of CLK after BLANK is taken high, Cb
should be present on this port.
Selection of Full-Scale or Reduced-Scale ITU.BT601 Modes (Available in Video DAC Mode Only)
In video DAC mode, BLNK_INT sets the blanking level generated on the DAC outputs as shown in Table 7. This
allows imposing a blanking level on the analog outputs corresponding to either full-scale code range or a
reduced-scale code range compliant to ITU-R.BT601. The blanking level is correctly positioned for either RGB or
YCbCr configurations, determined from the M1/M2 setting.
For generic DAC mode, BLNK_INT control is not available and the device always generates an output level
during BLANK low assuming full-scale input code range.
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Table 7. Full-Scale or ITU.BT601 Reduced-Scale Mode Selection and Impact on Blanking Level
Positioning
M1_INT
L
M2_INT
L
BLNK_INT
AVAILABLE
IN VIDEO
DAC (V) AND
GENERIC
DAC (G)
MODES?
L
CHANNEL OUTPUT LEVEL DURING
BLANK ACTIVE CORRESPONDING
TO DAC INPUT CODE:
OPERATION MODE
AGY
ABPb
ARPr
V, G
GBR 3x10b 4:4:4, full scale range
0
0
0
GBR 3x10b 4:4:4, ITU-R.BT601compliant range
64
64
64
L
L
H
V
L
H
L
V, G
YCbCr 3x10b 4:4:4, full scale range
0
512
512
64
512
512
L
H
H
V
YCbCr 3x10b 4:4:4, ITU-R.BT601compliant range
H
L
L
V
YCbCr 2x10b 4:2:2, ITU-R.BT601compliant range
64
512
512
H
L
H
V, G
YCbCr 2x10b 4:2:2, full scale range
0
512
512
H
H
L
V
YCbCr 1x10b 4:2:2, ITU-R.BT601compliant range
64
512
512
H
H
H
V, G
YCbCr 1x10b 4:2:2, full scale range
0
512
512
In full-scale range, the DAC is driven with input codes 0-1023 to the desired video level, set by the resistor
connected to the FSADJ terminal (for example, a full-scale video amplitude of 700 mV when terminated into 37.5
Ω and when using the nominal RFS value).
In reduced-scale ITU-R.BT601 range, it is the intention that full-scale video amplitude is reached when the device
is driven with digital inputs within the input code range shown in Table 8. Note that the code range is unequal
between RGBY on one hand and CbCr on the other hand. Figure 1 through Figure 4 illustrates the difference
between ITU-R.BT601 reduced-scale and full-scale code range operation. In reduced-range configuration, the
B/Cb and R/Cr components are digitally amplitude scaled internally. Note that there is no scaling on the G/Y
component. Therefore, to accommodate the 700-mV video compliance on all components, the DAC full-scale
output current needs to be increased between full-scale and reduced scale modes by a factor of 1023/(940-64)
by decreasing RFS in that proportion.
This implementation has the advantage of avoiding amplitude scaling on the most critical G/Y component, while
still providing the possibility for instantaneous overshoot/undershoot on the analog component video output when
illegal signals according to ITU-R.BT601, such as super-black or super-white, are applied to the device.
When using reduced-scale range, the output sync:video amplitude ratio is still 7:3, but now takes into account the
reduced code range, not the full-scale range, to determine this ratio. Therefore, proper sync amplitudes are
preserved in either mode, when the full-scale current is modified as explained higher. When changing DAC fullscale current using RFS, the sync amplitude level always scales proportionally with the video output compliance.
Note that even when using reduced-scale range, the midscale blanking level on ABPb and ARPr channels still
corresponds to code 512 = [64+(960-64)/2] when using YCbCr color space configuration. Table 8 shows the valid
reduced input code ranges for RGB and YCbCr operation on each of the input data buses. While the THS8135
allows reduced-scale code range with RGB data, video systems normally use it only with YCbCr type data.
Table 8. Input Code Ranges for ITU.BT601 Modes
OPERATING MODE
GY[ ]
RPr[ ]
BPb[ ]
RGB
64-940
64-940
64-940
YCbCr
64-940
64-960
64-960
DAC Operation
The analog output drivers generate a current of which the drive level can be user-modified by choosing an
appropriate resistor value RFS, connected to the FSADJ pin.
All current source amplitudes (video, blanking, and sync) are derived from an internal voltage reference such that
the relative amplitudes of sync, blank, and video are always equal to their nominal relationships.
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Figure 1 through Figure 4 show the nominal output voltage levels for full- or reduced-range input code range
configurations on R, G, B, and Y versus Cb and Cr channels.
Note that in full-scale input code range configuration, the blanking level is at 350 mV on all outputs; while in
reduced-scale operation it is at 400 mV on all outputs.
In reduced scale modes, after proper adjustment of RFS, the nominal 700-mV output compliance is reached from
an input code range of only 876 ( = 940-64) codes on G/Y, and of only 896 ( = 960-64) codes on R/Pr and B/Pr
output channels. The maximum excursions are ~817 mV ( = 1023/876 × 700 mV) on G/Y and ~800 mV ( =
876/896 × 817 mV) on B/Pb and R/Pr channels. Figure 4 shows that when using reduced-scale input code
range, the blanking level needs to be at 400 mV to accommodate the maximum negative excursion on B/Pr and
R/Pr channels.
The figures also show the excursions for the sync level positions in either full-scale or reduced-scale
configurations. These levels are internally adjusted and assure 300-mV sync excursions when using nominal
termination loads and properly adjusting RFS, as previously explained.
Input VO
Codes mV
1023 1050
700 mV
300 mV
0
350
300 mV
50
NOTE: Choose RFS for 700 mV from input codes 0−1023 on Y.
Figure 1. YRGB Outputs, Full-Scale Input Code Range
Input
Codes
VO
mV
1023 700
300 mV
700 mV
512
350
0
0
300 mV
Figure 2. CbCr Outputs, Full-Scale Input Code Range
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Input
Codes
Super-Black/Super-White
Excursions (Reduced-Scale
Input Code Range)
VO
mV
1023
940
1167
1100
64
0
400
350
700 mV
817 mV
300 mV
300 mV
100
NOTE: Choose RFS for 700 mV from input codes 64−940 on Y.
Figure 3. YRGB Outputs, Reduced-Scale Input Code Range
Input
Codes
Illegal Color
Difference Outputs
VO
mV
1023
960
800
700
512
400
64
0
50
0
800 mV
300 mV
700 mV
300 mV
0
Figure 4. CbCr Outputs, Reduced-Scale Input Code Range
Output Amplitude Control
The current drive on all three output channels (including sync) is controlled by a resistor RFS that must be
connected between FSADJ and AVSS. In all operation modes the relative amplitudes of these current drivers are
maintained irrespective of the RFS value, as long as a maximum current drive capability is not exceeded.
Therefore, a 7:3 video to sync ratio is preserved when adjusting RFS.
The sync generator is composed of different current sources that are internally routed to a corresponding DAC
output. Because they are additional to the video DACs, full 10-bit DAC resolution is preserved for video.
Depending on the setting of INS3_INT during SYNC low, the sync current drive is added to either only the green
channel output (sync-on-G/Y) if INS3_INT = L or all three channel outputs (sync-on-all) if INS3_INT = H. Sync
insertion is only available in video DAC mode.
Figure 5 shows the relationship between RFS and the current drive level on each channel for full-range DAC
input. When using reduced-scale range, the codes on the G/Y channel are not internally scaled (only BCb and
RCr channels are scaled). Therefore, the user should increase the DAC full-scale current by decreasing RFS by a
factor of 1023/(940-64) to map the reduced-scale Y input code range to the same output current drive level.
Because these are the current drive levels for the video DACs, they do not take into account the additional dc
bias for sync insertion when using video DAC mode. The voltage compliance outputs in Figure 5 assume
termination with a 37.5-Ω resistor.
10
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1450
Full-Scale DAC Output
Current Adjustment at
37.5-Ω DAC Termination
1350
VO − Output Voltage − mV
1250
1150
1050
950
850
750
650
550
450
350
1.8 2.3 2.8 3.3 3.8 4.3 4.8 5.3 5.8 6.3 6.8 7.3
R(FS) − Full-Scale Resistance − kΩ
Figure 5. Output Voltage vs Full-Scale Resistance
The user is free to connect another resistor value, but care should be taken not to exceed the maximum current
level on each of the DAC outputs as shown in the specifications section.
Backward Compatibility With the THS8133
Power Supply
The THS8135 is a functional superset to the THS8133 and is footprint compatible that is a board designed for
the THS8133 can also be used with the THS8135. Both devices come in the same package and have identical
pinouts. Only the power supply levels need to be adjusted as shown in Table 9.
Table 9. Power Supply Changes THS8133 vs THS8135
THS8133
THS8135
AVDD
5V
3.3 V
DVDD
3.3 V to 5 V
1.8 V
Device Configuration
The THS8135 samples both M1 and M2 on the second rising edge of CLK after a transition on SYNC in video
modes. Depending on the polarity of the transition, M1 is interpreted as either M1_INT or BLK_INT. In the
THS8133 the M1 signal is not sampled but continuously interpreted, and is only interpreted as M1_INT. The
THS8133 does not offer a reduced-scale input code range configuration and therefore does not require
BLNK_INT.
Only when this additional functionality, which is typical for video systems, is desired, a small change in the
configuration of the device is required by supplying a dynamically changing signal on M1, generated in a similar
way as M2, as shown in Table 10.
Note that this backward compatibility is due to the selection of full-scale versus reduced-scale configurations in
Table 7. All configurations that have equal logic levels for BLNK_INT and M1_INT produce full-scale input code
range, which are compatible with the THS8133. This allows the use of a signal tied high or low on M1, as on the
THS8133, for these backward compatible full-scale configurations.
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DAC Outputs
The position of the blanking levels in the THS8135 differs from the position of the blanking levels in the
THS8133. This is to accommodate both full- and reduced-scale configurations on this device, while the THS8133
only supported full-scale. When the DAC output is ac-coupled, as is typically the case, there is no change to the
output video waveform. Typically a clamp circuit at the receiving side will restore the signal to the proper dc level.
Video DAC Mode vs Generic DAC Mode
The THS8133 does not offer a generic DAC mode. The THS8135 uses only the same number of control signals
than the THS8133 but additionally introduces a generic video mode by specific use of a don’t care signal
combination of these control signals on the THS8133.
Programming Example for M2
(1)
Configuration of the device is normally static in a given application, although it is theoretically possible to
reconfigure the device during operation.
If M2_INT and INS3_INT need to be either low or high, the M2 pin is simply tied low or high. If M2_INT and
INS3_INT need to have different levels, these can be easily derived from the signal on the SYNC pin, as shown
in Table 10 and Figure 6.
(1)
Programming M1 is analogous.
Table 10. Generating M2 From SYNC
TO HAVE:
APPLY TO M2:
M2_INT
INS3_INT
L
H
... SYNC delayed by two CLK periods
H
L
... inverted SYNC delayed by two CLK periods
M1 can be generated similarly. Therefore, at most one inverter and two flip flops are needed to configure any of
the THS8135 modes using M1 and M2.
CLK
SYNC
M2
(= SYNC_delayed)
INS3_INT
if (M2 = SYNC_delayed) → M2_INT = L and INS3_INT = H
M2_INT
M2
(= Not SYNC_delayed)]
INS3_INT
if (M2 = NOT SYNC_delayed) → M2_INT = H and INS3_INT = L
M2_INT
Figure 6. Generating INS3_INT and M2_INT From M2
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CLK
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T0
T1
T2
T3
T4
T5
T6
T7
T8
RCr(0)
RCr(1)
RCr(2)
RCr(3)
RCr(4)
RCr(5)
RCr(6)
RCr(7)
RCr(8)
GY(0)
GY(1)
GY(2)
GY(3)
GY(4)
GY(5)
GY(6)
GY(7)
GY(8)
BCb(0)
BCb(1)
BCb(2)
BCb(3)
BCb(4)
BCb(5)
BCb(6)
BCb(7)
BCb(8)
Data Path Latency = 7.5 CLK Cycles
RCr(0), GY(0), BCb(0) Registered
ARPr, AGY, ABPb Output
Corresponding to RCr(0), GY(0), BCb(0)
Figure 7. Input Format and Latency YCbCr 4:4:4 and GBR 4:4:4 Modes
T0
T1
BLANK
T2
T3
T4
T5
T6
T7
T8
T9
T10
T11
First Registered Sample on RCr[9:0] after L ⇒ H on BLANK is Interpreted as Cb[9:0]
RCr[9:0]
Cb(0)
Cr(0)
Cb(2)
Cr(2)
Cb(4)
Cr(4)
Cb(6)
Cr(6)
Cb(8)
Cr(8)
Cb(10)
Cr(10)
GY[9:0]
Y(0)
Y(1)
Y(2)
Y(3)
Y(4)
Y(5)
Y(6)
Y(7)
Y(8)
Y(9)
Y(10)
Y(11)
BCb[9:0]
Data Path Latency = 9.5 CLK Cycles
Cb(0), Y(0) Registered
ARPr, AGY, ABPb Output
Corresponding to Cr(0),Y(0), Cb(0)
Cr(0), Y(1) Registered
Figure 8. Input Format and Latency YCbCr 4:2:2 2x10-Bit Mode
CLK
T0
T1
T2
T3
T4
T5
T6
T7
T8
T9
T10
T11
First Registered Sample on GY[9:0] after L ⇒ H on BLANK is Interpreted as Cb[9:0]
BLANK
RCr[9:0]
GY[9:0]
Cb(0)
Y(0)
Cr(0)
Y(2)
Cb(4)
Y(4)
Cr(4)
Y(6)
Cb(8)
Y(8)
Cr(8)
Y(10)
BCb[9:0]
Data Path Latency = 10.5 CLK Cycles
Cb(0) Registered
Cr(0) Registered
Y(0) Registered
ARPr, AGY, ABPb Output
Corresponding to Cr(0),Y(0), Cb(0)
Figure 9. Input Format and Latency YCbCr 4:2:2 1x10-Bit Mode
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Figure 10 shows how to control the SYNC, SYNC_T, and BLANK signals to generate tri-level sync levels and
blanking at the DAC output in video mode. A bi-level (negative) sync can be generated similarly by avoiding the
positive transition on SYNC_T during SYNC low.
Note that on the THS8135 it is required to keep SYNC_T low outside the sync interval to avoid entering the
generic DAC mode.
CLK
ts
SYNC
th
t d(D)
t d(D)
t d(D)
t d(D)
SYNC_T
BLANK
D(0)
DATA[9:0]
D(1)
Value
Corresponds
to D(0)
Figure 10. Sync and Blanking Generation
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Absolute Maximum Ratings (1)
over operating free-air temperature range (unless otherwise noted)
VDD
Supply voltage
Supply voltage, difference between analog and digital
supplies
AVDD to AVSS
-0.5 V to 3.6 V
DVDD to DVSS
-0.5 V to 2 V
AVDD to DVDD,
AVSS to DVSS
-0.5 to 0.5 V
Digital input voltage range to DVSS
TA
Operating free-air temperature range
Tstg
Storage temperature range
(1)
-0.5 V to DVDD + 0.5 V
0°C to 70°C
-55°C to 150°C
Stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. These are stress ratings
only, and functional operation of the device at these or any other conditions beyond those indicated under recommended operating
conditions is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
Thermal Specifications
TEST CONDITIONS (1)
PARAMETER
θJA
Junction-to-ambient thermal resistance, still air
θJC
Junction-to-case thermal resistance, still air
TJ(MAX)
Maximum junction temperature for reliable
operation
(1)
MIN
TYP
Thermal PAD soldered to 4-layer High-K
PCB
29.11
Low-K PCB, Thermal PAD not soldered
64.42
MAX
UNIT
°C/W
0.12
°C/W
105
°C
UNIT
When split ground planes are used, attach the thermal pad to the analog ground plane.
Recommended Operating Conditions
over operating free-air temperature range (unless otherwise noted)
MIN
NOM
MAX
AVDD
3
3.3
3.6
DVDD
1.65
1.8
2
Power Supply
VDD
Supply voltage
V
Digital and Reference Inputs
VIH
High-level input voltage
1.2
DVDD
VIL
Low-level input voltage
DVSS
0.7
V
fclk
Clock frequency
0
240
MHz
tw(CLKH)
Clock high pulse duration
40%
60%
CLK
period
tw(CLKL)
Clock low pulse duration
40%
60%
CLK
period
RFS
FSADJ resistor (1)
(1)
3.8
V
kΩ
RFS should be chosen such that the maximum full-scale DAC output current (IFS) does not exceed their maximum stated levels. This
yields the nominal output voltage compliance at the nominal load termination of 37.5 Ω.
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Electrical Characteristics
over recommended operating conditions with fCLK = 240 MSPS and use of internal reference voltage VREF, with
RFS = RFS(nom) and 37.5-Ω load termination (unless otherwise noted)
Power Supply
1 MHz, -1 dBFS digital sine simultaneously applied to all three channels
PARAMETER
IAVDD
IDVDD
Operating supply current, analog
Operating supply current, digital
TEST CONDITIONS
MIN
TYP
MAX
RGB
89
95
100
YCbCr
71
76
80
Generic (700 mV)
63
66
69
AVDD = 3.3 V, DVDD = 1.8 V,
CLK = 80 MSPS
AVDD = 3.3 V, DVDD = 1.8 V,
CLK = 80 MSPS
RGB
14.5
15.1
15.7
YCbCr
11.7
12.15
12.7
Generic (700 mV)
14.64
15.1
15.7
RGB
328
338
350
YCbCr
262
270
280
Generic (700 mV)
UNIT
mA
mA
Power dissipation
AVDD = 3.3 V, DVDD = 1.8 V,
CLK = 80 MSPS
237
245
252
IAVDD
Operating supply current, analog
AVDD = 3.3 V, DVDD = 1.8 V,
CLK = 240 MSPS
RGB
89
95
100
Generic (700 mV)
63
66
69
IDVDD
Operating supply current, digital
AVDD = 3.3 V, DVDD = 1.8 V,
CLK = 240 MSPS
RGB
38
40
41
Generic (700 mV)
38
40
41.1
PD
Power dissipation
AVDD = 3.3 V, DVDD = 1.8 V,
CLK = 240 MSPS
RGB
373
384
394
Generic (700 mV)
281
290
298
IAVDD
Operating supply current, analog
AVDD = 3.3 V, DVDD = 1.8 V,
CLK = 80 MSPS
Generic (1.3 V)
114
mA
IDVDD
Operating supply current, digital
AVDD = 3.3 V, DVDD = 1.8 V,
CLK = 80 MSPS
Generic (1.3 V)
16
mA
PD
Power dissipation
AVDD = 3.3 V, DVDD = 1.8 V,
CLK = 80 MSPS
Generic (1.3 V)
405
mW
IAVDD
Operating supply current, analog
AVDD = 3.3 V, DVDD = 1.8 V,
CLK = 240 MSPS
Generic (1.3 V)
114
mA
IDVDD
Operating supply current, digital
AVDD = 3.3 V, DVDD = 1.8 V,
CLK = 240 MSPS
Generic (1.3 V)
41
mA
PD
Power dissipation
AVDD = 3.3 V, DVDD = 1.8 V,
CLK = 240 MSPS
Generic (1.3 V)
450
mW
PD
mW
mA
mA
mW
Digital Inputs – DC Characteristics
PARAMETER
IIH
High-level input current
IIL
Low-level input current
TEST CONDITIONS
AVDD = 3.3 V, DVDD = 1.8 V,
Digital inputs and CLK at 0 V for IIL,
Digital inputs and CLK at 2 V for IIH
IIL(CLK) Low-level input current, CLK
IIH(CLK) High-level input current, CLK
CI
Input capacitance
ts
Data and control inputs setup time
th
Data and control inputs hold time
td(D)
(1)
16
MIN
TYP
UNIT
1
µA
-1
µA
-1
1
µA
-1
1
µA
TA = 25°C
5
2
pF
ns
500
Digital process delay from first registered color
component of pixel (1)
MAX
ps
RGB and YCbCr 4:4:4
7.5
YCbCr 4:2:2, 2 x 10 bit
9.5
YCbCr 4:2:2, 1 x 10 bit
10.5
CLK
periods
This parameter is assured by design. The digital process delay is defined as the number of CLK cycles required for the first registered
color component of a pixel, starting from the time of registering it on the input bus, to propagate through all processing and appear at the
DAC output drivers. The remaining delay through the IC is the analog delay td(A) of the analog output drivers.
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Analog (DAC) Outputs
PARAMETER
TEST CONDITIONS
MIN
DAC resolution
INL
Integral nonlinearity
Differential nonlinearity
PSRR
Power supply ripple
rejection ratio of DAC
output (full scale)
XTALK
Crosstalk between
channels (2)
Vrefo
Voltage reference
output
RR
VREF output
resistance
KIMBAL
Imbalance between
DACs
-1.1/0.9
-2/1.5
Static, best-fit, sync-on-all, video mode, RGB ITU.R-BT601
-1.2/0.8
-2/1.5
-1.61/0.94
-2/1.5
Static, sync-on-all, video mode, RGB full-scale
±0.4
±1
Static, sync-on-all, video mode, RGB ITU.R-BT601
±0.5
±1
38.5
f = 1 MHz
-63
f = 30 MHz
-39
LSB
dB
dB
1.13
1.15
1.16
V
276.5
284
294
Ω
Video mode, RGB full-scale
-2%
1.8%
2%
Video mode, RGB ITU-R.BT601
-3%
2.8%
3%
Video mode, RGB full-scale
0.7
DAC output compliance
Video mode, RGB ITU-R.BT601
voltage (video only) (4)
Generic mode
IFS
LSB
-0.32/0.24
f = DC (1)
CLK = 80 MSPS (3)
UNIT
bits
Static, best-fit, sync-on-all, video mode, RGB full-scale
Static, generic mode, 1.3 V
VOC
MAX
10
Static, best fit, generic mode, 1.3 V
DNL
TYP
0.817
V
1.3
Video mode, full-scale
RGB, sync-on-all
AGY
27
28
29.3
ABPb and ARPr
27
28
29.3
Video mode, full-scale
YCbCr, sync-on-all
AGY
27
28
29.3
ABPb and ARPr
18
18.67
19.5
CLK = 80 MSPS (5)
Video mode, ITUR.BT601RGB, sync-onall
AGY
30
31.18
32.0
ABPb and ARPr
30
31.18
32.3
Video mode, ITUR.BT601 YCbCr, syncon-all
AGY
30
31.18
32.1
ABPb and ARPr
20
21.39
22.5
mA
tRDAC
DAC output current rise
CLK = 80 MSPS, 10 to 90% of full-scale
time
3.2
3.5
4.2
ns
tFDAC
DAC output current fall
time
CLK = 80 MSPS, 10 to 90% of full-scale
3.2
3.5
4.2
ns
td(A)
Analog output delay
Measured from CLK = VIH(min) to 50% of full-scale
transition (6)
tS
Analog output settling
time
SFDR
Spurious-free dynamic
range
BW
Bandwidth
Eglitch
Glitch energy
(1)
(2)
(3)
(4)
(5)
(6)
(7)
4
ns
Measured from 50% of full scale transition on output to
output settling, within 2% (7)
15
ns
1 MHz, -1 dBFS digital sine input
55
dB
1 dB
50
3 dB
100
Full-scale code transition at 240 MSPS
25
MHz
pVs
PSRR is measured with a 0.1-µF capacitor between the COMP and AVDD pin; with a 0.1-µF capacitor connected between the VREF
pin and AVSS. The ripple amplitude is within the range 100 mVp-p to 500 mVp-p with the DAC output set to full scale and a doubleterminated 75 Ω (= 37.5 Ω) load. PSRR is defined as 20 x log(ripple voltage at DAC output/ripple voltage at AVDD input). Limits from
characterization only.
Crosstalk spec applies to each possible pair of the three DAC outputs. Limits are from characterization only.
The imbalance between DACs applies to all possible pairs of the three DACs.
Values at RFS = RFS(nom). Limits from characterization only.
Values at RFS = RFS(nom).
This value excludes the digital process delay, tD(D). Limits from characterization only.
Limit from characterization only. Measured on Y channel with other channels not driven.
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400
390
380
P − Power − mW
370
360
350
340
330
320
310
300
0
50
100
150
200
250
300
f − Frequency − MHz
Figure 11. Power vs Clock Frequency, RGB Mode, 1-MHz Input Tone on All Channels
600
P − Power − mW
500
400
300
200
100
0
0
50
100
150
200
250
300
f − Frequency − MHz
Figure 12. Power vs Clock Frequency, Generic DAC Mode 1.3-V Output, Full-Scale Input Toggle on All
Channels
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0.5
DNL − Differential Nonlinearity − LSB
0.4
0.3
0.2
0.1
0.0
−0.1
−0.2
−0.3
−0.4
−0.5
1
76
151
226
301
376
451
526
601
676
751
826
901
976
1051
Input Code
Figure 13. DNL, Generic DAC Mode (1.3-V Output Compliance)
1.5
INL − Integral Nonlinearity − LSB
1.0
0.5
0.0
−0.5
−1.0
−1.5
1
103
205
307
409
511
613
715
817
919
1021
Input Code
Figure 14. Best-Fit INL, Generic DAC Mode (1.3-V Output Compliance)
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0
−1
Amplitude − dB
−2
−3
−4
−5
−6
0
10
20
30
40
50
60
70
80
90
100
110
120
130
140
150
f − Frequency − MHz
Figure 15. Amplitude Response vs Input Frequency at 240 MSPS
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REVISION HISTORY
Revision
SLAS343B
Comments
Added Thermal Specifications.
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PACKAGE OPTION ADDENDUM
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10-Dec-2020
PACKAGING INFORMATION
Orderable Device
Status
(1)
Package Type Package Pins Package
Drawing
Qty
Eco Plan
(2)
Lead finish/
Ball material
MSL Peak Temp
Op Temp (°C)
Device Marking
(3)
(4/5)
(6)
THS8135PHP
ACTIVE
HTQFP
PHP
48
250
RoHS & Green
NIPDAU
Level-3-260C-168 HR
0 to 70
THS8135
THS8135PHPG4
ACTIVE
HTQFP
PHP
48
250
RoHS & Green
NIPDAU
Level-3-260C-168 HR
0 to 70
THS8135
(1)
The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2)
RoHS: TI defines "RoHS" to mean semiconductor products that are compliant with the current EU RoHS requirements for all 10 RoHS substances, including the requirement that RoHS substance
do not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, "RoHS" products are suitable for use in specified lead-free processes. TI may
reference these types of products as "Pb-Free".
RoHS Exempt: TI defines "RoHS Exempt" to mean products that contain lead but are compliant with EU RoHS pursuant to a specific EU RoHS exemption.
Green: TI defines "Green" to mean the content of Chlorine (Cl) and Bromine (Br) based flame retardants meet JS709B low halogen requirements of
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