LTC2157-12/
LTC2156-12/LTC2155-12
Dual 12-Bit 250Msps/
210Msps/170Msps ADCs
FEATURES
DESCRIPTION
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The LTC®2157-12/LTC2156-12/LTC2155-12 are a family of
dual 250Msps/210Msps/170Msps 12-bit A/D converters
designed for digitizing high frequency, wide dynamic range
signals. They are perfect for demanding communications
applications with AC performance that includes 68.5dB
SNR and 90dB spurious free dynamic range (SFDR). The
1.25GHz input bandwidth allows the ADC to achieve high
undersampling ratio with very low attenuation. The latency
is only six clock cycles.
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68.5dB SNR
90dB SFDR
Low Power: 628mW/592mW/545mW Total
Single 1.8V Supply
DDR LVDS Outputs
Easy-to-Drive 1.5VP-P Input Range
1.25GHz Full-Power Bandwidth S/H
Optional Clock Duty Cycle Stabilizer
Low Power Sleep and Nap Modes
Serial SPI Port for Configuration
Pin Compatible 14-Bit Versions
64-Lead (9mm × 9mm) QFN Package
DC specs include ±0.26LSB INL (typ), ±0.16LSB DNL (typ)
and no missing codes over temperature. The transition
noise is 0.54LSBRMS.
The digital outputs are double data rate (DDR) LVDS.
APPLICATIONS
The ENC+ and ENC– inputs can be driven differentially with
a sine wave, PECL, LVDS, TTL, or CMOS inputs. An optional
clock duty cycle stabilizer allows high performance at full
speed for a wide range of clock duty cycles.
Communications
n Cellular Basestations
n Software Defined Radios
n Medical Imaging
n High Definition Video
n Testing and Measurement Instruments
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L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
TYPICAL APPLICATION
VDD
CLOCK
ANALOG
INPUT
S/H
CLOCK/DUTY
CYCLE
CONTROL
S/H
12-BIT
PIPELINED
ADC CORE
CORRECTION
LOGIC
OUTPUT
DRIVERS
DA10_11
•
•
•
DA0_1
OGND
OVDD
CHANNEL B
12-BIT
PIPELINED
ADC CORE
CORRECTION
LOGIC
OUTPUT
DRIVERS
DB10_11
•
•
•
DB0_1
–20
–40
–60
–80
–100
DDR
LVDS
GND
21576512 TA01
0
DDR
LVDS
AMPLITUDE (dBFS)
ANALOG
INPUT
LTC2157-12: 32K Points 2-Tone FFT,
fIN = 71MHZ and 69MHz, 250Msps
OVDD
CHANNEL A
OGND
–120
0
20
40
60
80
100
FREQUENCY (MHz)
120
21576512 G11
21576512fb
For more information www.linear.com/LTC2157-12
1
LTC2157-12/
LTC2156-12/LTC2155-12
TOP VIEW
VDD 1
VDD 2
GND 3
AINA+ 4
AINA– 5
GND 6
SENSE 7
VREF 8
GND 9
VCM 10
GND 11
AINB– 12
AINB+ 13
GND 14
VDD 15
VDD 16
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
65
GND
OGND
DA2_3+
DA2_3–
DA0_1+
DA0_1–
NC
NC
CLKOUT+
CLKOUT–
DB10_11+
DB10_11–
DB8_9+
DB8_9–
DB6_7+
DB6_7–
OGND
VDD
GND
ENC+
ENC–
GND
OF –
OF +
NC
NC
DB0_1–
DB0_1+
DB2_3–
DB2_3+
DB4_5 –
DB4_5+
OVDD
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
Supply Voltage
VDD, OVDD................................................. –0.3V to 2V
Analog Input Voltage
AINA/B+, AINA/B –, PAR/SER,
SENSE (Note 3)......................... –0.3V to (VDD + 0.2V)
Digital Input Voltage
ENC+, ENC– (Note 3)................. –0.3V to (VDD + 0.3V)
CS, SDI, SCK (Note 4)............................ –0.3V to 3.9V
SDO (Note 4).............................................. –0.3V to 3.9V
Digital Output Voltage................. –0.3V to (OVDD + 0.3V)
Operating Temperature Range
LTC2157C, LTC2156C, LTC2155C............. 0°C to 70°C
LTC2157I, LTC2156I, LTC2155I.............–40°C to 85°C
Storage Temperature Range................... –65°C to 150°C
PIN CONFIGURATION
VDD
PAR/SER
CS
SCK
SDI
SDO
GND
DA10_11+
DA10_11–
DA8_9+
DA8_9–
DA6_7+
DA6_7–
DA4_5+
DA4_5 –
OVDD
(Notes 1, 2)
64
63
62
61
60
59
58
57
56
55
54
53
52
51
50
49
ABSOLUTE MAXIMUM RATINGS
UP PACKAGE
64-LEAD (9mm × 9mm) PLASTIC QFN
TJMAX = 150°C, θJA = 20°C/W
EXPOSED PAD (PIN 65) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC2157CUP-12#PBF
LTC2157CUP-12#TRPBF
LTC2157UP-12
64-Lead (9mm × 9mm) Plastic QFN
0°C to 70°C
LTC2157IUP-12#PBF
LTC2157IUP-12#TRPBF
LTC2157UP-12
64-Lead (9mm × 9mm) Plastic QFN
–40°C to 85°C
LTC2156CUP-12#PBF
LTC2156CUP-12#TRPBF
LTC2156UP-12
64-Lead (9mm × 9mm) Plastic QFN
0°C to 70°C
LTC2156IUP-12#PBF
LTC2156IUP-12#TRPBF
LTC2156UP-12
64-Lead (9mm × 9mm) Plastic QFN
–40°C to 85°C
LTC2155CUP-12#PBF
LTC2155CUP-12#TRPBF
LTC2155UP-12
64-Lead (9mm × 9mm) Plastic QFN
0°C to 70°C
LTC2155IUP-12#PBF
LTC2155IUP-12#TRPBF
LTC2155UP-12
64-Lead (9mm × 9mm) Plastic QFN
–40°C to 85°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
21576512fb
2
For more information www.linear.com/LTC2157-12
LTC2157-12/
LTC2156-12/LTC2155-12
CONVERTER
CHARACTERISTICS l denotes the specifications which apply over the full operating
The
temperature range, otherwise specifications are at TA = 25°C. (Note 5)
PARAMETER
CONDITIONS
MIN
Resolution (No Missing Codes)
l
LTC2157-12
TYP MAX
MIN
12
LTC2156-12
TYP MAX
LTC2155-12
MIN
TYP MAX
12
UNITS
12
Bits
Integral Linearity Error
Differential Analog Input (Note 6) l
–2.3
±0.26
2.3
–2.2
±0.30
2.2
–1.9
±0.30
1.9
LSB
Differential Linearity Error
Differential Analog Input
l
–0.6
±0.16
0.8
–0.6
±0.16
0.6
–0.6
±0.16
0.6
LSB
Offset Error
(Note 7)
l
–13
±5
13
–13
±5
13
–13
±5
13
mV
Gain Error
External Reference
l
–4
±1
2.2
–4
±1
2.2
–4
±1
2.2
%FS
Offset Drift
Full-Scale Drift
Internal Reference
External Reference
Transition Noise
±20
±20
±20
µV/°C
±30
±10
±30
±10
±30
±10
ppm/°C
ppm/°C
0.54
0.54
0.54
LSBRMS
ANALOG
INPUT
The
l denotes the specifications which apply over the full operating temperature range, otherwise
specifications are at TA = 25°C. (Note 5)
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
VIN
Analog Input Range (AIN+ – AIN–)
1.7V < VDD < 1.9V
l
VIN(CM)
Analog Input Common Mode (AIN+ + AIN–)/2
Differential Analog Input (Note 8)
l
VCM – 20mV
VCM
VCM + 20mV
V
VSENSE
External Voltage Reference Applied to SENSE External Reference Mode
l
1.200
1.250
1.300
V
1.5
VP-P
IIN1
Analog Input Leakage Current
0 < AIN+, AIN– < VDD, No Encode
l
–1
1
µA
IIN2
PAR/SER Input Leakage Current
0 < PAR/SER < VDD
l
–1
1
µA
IIN3
SENSE Input Leakage Current
1.2V < SENSE < 1.3V
l
–1
1
µA
tAP
Sample-and-Hold Acquisition Delay Time
1
tJITTER
Sample-and-Hold Acquisition Delay Jitter
0.15
ns
CMRR
Analog Input Common Mode Rejection Ratio
BW-3B
Full-Power Bandwidth
psRMS
75
dB
1250
MHz
DYNAMIC ACCURACY
The l denotes the specifications which apply over the full operating temperature range,
otherwise specifications are at TA = 25°C. AIN = –1dBFS. (Note 5)
SYMBOL
PARAMETER
CONDITIONS
SNR
Signal-to-Noise Ratio
15MHz Input
70MHz Input
140MHz Input
SFDR
Spurious Free Dynamic Range 15MHz Input
2nd or 3rd Harmonic
70MHz Input
140MHz Input
Spurious Free Dynamic Range 15MHz Input
4th Harmonic or Higher
70MHz Input
140MHz Input
S/(N+D)
Crosstalk
Signal-to-Noise Plus
Distortion Ratio
Crosstalk Between Channels
15MHz Input
70MHz Input
140MHz Input
Up to 315MHz Input
MIN
l
l
l
l
LTC2157-12
TYP MAX
66.9
68.5
68.4
68.0
71
90.6
88
80
81
98
95
85
66.1
68.4
68.3
67.7
MIN
LTC2156-12
TYP MAX
67.3
68.5
68.3
67.9
74
90.1
89
81
82
98
95
87
66.7
68.4
68.3
67.7
–95
–95
LTC2155-12
MIN
TYP MAX
UNITS
67.4
68.5
68.3
67.8
dBFS
dBFS
dBFS
75
90
88
80
dBFS
dBFS
dBFS
83
98
95
88
dBFS
dBFS
dBFS
66.8
68.4
68.3
67.7
dBFS
dBFS
dBFS
–95
dB
21576512fb
For more information www.linear.com/LTC2157-12
3
LTC2157-12/
LTC2156-12/LTC2155-12
INTERNAL
REFERENCE CHARACTERISTICS l denotes the specifications which apply over the
The
full operating temperature range, otherwise specifications are at TA = 25°C. (Note 5)
PARAMETER
CONDITIONS
VCM Output Voltage
IOUT = 0
MIN
TYP
MAX
0.435 • VDD – 18mV
0.435 • VDD
0.435 • VDD + 18mV
VCM Output Temperature Drift
UNITS
±37
VCM Output Resistance
–1mA < IOUT < 1mA
VREF Output Voltage
IOUT = 0
ppm/°C
4
1.225
Ω
1.250
VREF Output Temperature Drift
1.275
V
±30
VREF Output Resistance
–400µA < IOUT < 1mA
VREF Line Regulation
1.7V < VDD < 1.9V
V
ppm/°C
7
Ω
0.6
mV/V
POWER
REQUIREMENTS l denotes the specifications which apply over the full operating temperature
The
range, otherwise specifications are at TA = 25°C. (Note 5)
SYMBOL PARAMETER
CONDITIONS
MIN
LTC2157-12
TYP MAX
MIN
LTC2156-12
TYP MAX
LTC2155-12
MIN
TYP MAX
UNITS
VDD
Analog Supply Voltage
(Note 9)
l
1.7
1.8
1.9
1.7
1.8
1.9
1.7
1.8
1.9
V
OVDD
Output Supply Voltage
(Note 9)
l
1.7
1.8
1.9
1.7
1.8
1.9
1.7
1.8
1.9
V
IVDD
Analog Supply Current
l
309
345
291
320
266
295
mA
IOVDD
Digital Supply Current
1.75mA LVDS Mode
3.5mA LVDS Mode
l
l
40
68
46
76
38
66
45
75
37
65
42
74
mA
mA
PDISS
Power Dissipation
1.75mA LVDS Mode
3.5mA LVDS Mode
l
l
628
679
704
758
592
643
657
711
545
596
607
665
mW
mW
PSLEEP
Sleep Mode Power
Clock Disabled
Clocked at fS(MAX)
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