BUF04701
0470
1A
®
SBOS214B – SEPTEMBER 2001 – REVISED JULY 2004
4-Channel, Rail-to-Rail, CMOS
BUFFER AMPLIFIER
FEATURES
DESCRIPTION
● UNITY GAIN BUFFER
The BUF04701 is a 4-channel, low-power, high-voltage railto-rail input/output buffer. Operating on supplies ranging from
3.5V to 12V (±1.75V to ±6V), the BUF04701 has a 3dB
bandwidth of 8MHz with a slew rate of 10V/µs, and requires
only 1.1mA quiescent current. The BUF04701 features railto-rail input and output capability, giving maximum dynamic
range at any supply voltage.
● RAIL-TO-RAIL INPUT/OUTPUT
● WIDE BANDWIDTH: 8MHz
● HIGH SLEW RATE: 10V/µs
● LOW QUIESCENT CURRENT: 1.1mA
● TINY PACKAGE: MSOP-10, TSSOP-14
Featuring fast slewing and settling times, as well as a high
output drive, the BUF04701 is ideal for use as a voltage
reference buffer in Thin Film Transistor Liquid Crystal Displays (TFT-LCDs).
APPLICATIONS
● TFT-LCD REFERENCE DRIVERS
The BUF04701 is available in an MSOP-10 package, providing the smallest footprint and thinnest package option available, as well as the TSSOP-14 package with a pinout that
corresponds to standard quad op amps. This makes it easy to
replace quad op amps in existing LCD displays with the low
cost BUF04701, without changing the layout. The BUF04701
operates over a temperature range of –40°C to +125°C.
● NOTEBOOKS
● ELECTRONIC GAMES
● ELECTRONIC BOOKS
● PERSONAL COMMUNICATION DEVICES
● PDA
● ACTIVE FILTERS
BUF04701 RELATED PRODUCTS
● ADC/DAC BUFFER
Out A
1
NC(1)
2
A
14
Out D
13
NC(1)
PRODUCT
1.2 MHz BW, 3.3mA IQ
7MHz GBW, 1.5mA IQ, VS 3.5 - 12
5.9MHz GBW, 4.5mA IQ, VS = 4V - 44V
10MHz GBW, 2.5mA IQ, 16V/µs SR
BUF11702
OPA4743
TLE2144/2
TLC084
C
Out A
1
10 Out D
In A
2
9
In D
In C
+V
3
8
–V
In A
3
12
In D
+V
4
11
–V
In B
5
10
B
FEATURES
D
NC(1)
6
9
NC(1)
In B
4
7
In C
Out B
7
8
Out C
Out B
5
6
Out C
MSOP-10 (DGS)
TSSOP-14 (PW)
NOTE: (1) NC Means No Internal Connection
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.
All trademarks are the property of their respective owners.
Copyright © 2001-2004, Texas Instruments Incorporated
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
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ABSOLUTE MAXIMUM RATINGS(1)
ELECTROSTATIC
DISCHARGE SENSITIVITY
Supply Voltage, V+ to V– ................................................................. 13.2V
Signal Input Terminals, Voltage(2) ................... (V–) –0.5V to (V+) + 0.5V
Current(2) .................................................... 10mA
Output Short-Circuit(3) .............................................................. Continuous
Operating Temperature .................................................. –40°C to +125°C
Storage Temperature ..................................................... –65°C to +150°C
Junction Temperature .................................................................... +150°C
Lead Temperature (soldering, 10s) ............................................... +300°C
This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with
appropriate precautions. Failure to observe proper handling
and installation procedures can cause damage.
NOTES: (1) Stresses above these ratings may cause permanent damage.
Exposure to absolute maximum conditions for extended periods may
degrade device reliability. (2) Input terminals are diode-clamped to the
power-supply rails. Input signals that can swing more than 0.5V beyond the
supply rails should be current-limited to 10mA or less. (3) Short-circuit to
ground, one amplifier per package.
ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits
may be more susceptible to damage because very small
parametric changes could cause the device not to meet its
published specifications.
PACKAGE/ORDERING INFORMATION(1)
PRODUCT
PACKAGE-LEAD
PACKAGE
DESIGNATOR
Quad
BUF04701
BUF04701
MSOP-10
TSSOP-14
DGS
PW
SPECIFIED
TEMPERATURE
RANGE
PACKAGE
MARKING
ORDERING
NUMBER
TRANSPORT
MEDIA, QUANTITY
–40°C to +125°C
–40°C to +125°C
BUF04701
04701A
BUF04701AIDGSR
BUF04701AIPWR
Tape and Reel, 2500
Tape and Reel, 2500
NOTE: (1) For the most current package and ordering information, see the Package Option Addendum located at the end of this data sheet.
2
BUF04701
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SBOS214B
ELECTRICAL CHARACTERISTICS: VS = +3.5V to +12V
Boldface limits apply over the specified temperature range, TA = –40°C to +125°C
At TA = +25°C, RL = 10kΩ connected to VS / 2 and VOUT = VS / 2, unless otherwise noted.
BUF04701
PARAMETER
OFFSET VOLTAGE
Input Offset Voltage
Drift
vs Power Supply
Over Temperature
Channel Separation, DC
f = 10kHz
CONDITION
VOS
dVOS/dT
PSRR
INPUT VOLTAGE RANGE
Common-Mode Voltage Range
INPUT BIAS CURRENT
Input Bias Current
MIN
VS = ±5, VCM = 0
VS = 3.5V to 12V, VCM = VS/2 – 0.5V
VS = 3.5V to 12V, VCM = VS/2 – 0.5V
VCM
IB
en
in
VCM = VS/2
POWER SUPPLY
Specified Voltage Range, Single Supply
Specified Voltage Range, Dual Supplies
Operating Voltage Range
Quiescent Current (per amplifier)
over Temperature
TEMPERATURE RANGE
Specified Range
Operating Range
Storage Range
Thermal Resistance
TSSOP Surface Mount
MSOP Surface Mount
VS = ±6V, VCM = 0
VS = ±6V, VCM = 0
VS = ±6V, VCM = 0
RL = 10kΩ
RL = 2kΩ
RL = 2kΩ
mV
µV/°C
100
200
µV/V
µV/V
µV/V
dB
±10
pA
5 • 1012 || 4
Ω || pF
11
30
2.5
µVrms
nV/√Hz
fA/√Hz
1.000
1.000
75
150
ISC
1.0025
1.005
±32
mV
mV
mV
mA
8
10
9
0.2
0.001
MHz
V/µs
µs
µs
%
200
250
CL = 10pF
BW
SR
tS
THD+N
VS = ±6V
VS = ±6V, 5V Step
VIN = VS
VS = ±6V, VO = 1Vrms, G = 1,
f = 6kHz, VCM = VS/2
VS
IQ
3.5
±1.75
12
±6
+3.5 to +12
1.1
IO = 0
–40
–40
–65
θJA
100
200
BUF04701
SBOS214B
±7
1
0.9975
0.995
OUTPUT
Voltage Output Swing from Rail
FREQUENCY RESPONSE
Bandwidth –3dB
Slew Rate
Settling Time, 0.1%
Overload Recovery Time
Total Harmonic Distortion + Noise
±1.5
±8
20
UNITS
Limited by Output Range
TRANSFER CHARACTERISTIC
Gain
over Temperature
over Temperature
Short-Circuit Current
MAX
1
110
INPUT IMPEDANCE
Common-Mode
NOISE
Input Voltage Noise, f = 0.1Hz to 10Hz
Input Voltage Noise Density, f = 10kHz
Input Current Noise Density, f = 1kHz
TYP
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1.5
1.7
V
V
V
mA
mA
+125
+125
+150
°C
°C
°C
°C/W
°C/W
3
TYPICAL CHARACTERISTICS
At TA = +25°C, VS = ±6V, and RL = 10kΩ, unless otherwise noted.
PSRR vs FREQUENCY
MAXIMUM AMPLITUDE vs FREQUENCY
120
7
V+
6
100
5
Amplitude (V)
PSRR (dB)
V–
80
60
40
4
VS = ± 6V
3
2
20
1
0
0
10
100
1k
10k
100k
1M
10
100
1k
10k
100k
1M
Frequency (Hz)
Frequency (Hz)
CHANNEL SEPARATION vs FREQUENCY
INPUT CURRENT AND VOLTAGE SPECTRAL
NOISE vs FREQUENCY
140
10M
10k
10k
1k
1k
100
80
60
40
100
100
10
10
1
1
20
0
0.1
10
100
1k
10k
100k
Frequency (Hz)
1M
10M
0.1
0.1
1
10
100
1k
100k
1M
Frequency (Hz)
GAIN vs FREQUENCY
GAIN vs FREQUENCY
20
20
CL = 1000pF
RL = 10kΩ
CL
10
RL
CL
10
CL = 10pF
Gain (dB)
RL = 1kΩ
Gain (dB)
10k
RL = 500Ω
0
RL = 350Ω
RL
CL = 500pF
RL = 200Ω
CL = 100pF
0
CL = 10pF
RL = 200Ω
–10
–10
RL = 100Ω
–20
–20
10k
100k
1M
10M
100M
Frequency (Hz)
4
10k
100k
1M
10M
100M
Frequency (Hz)
BUF04701
www.ti.com
SBOS214B
Current Noise (fA/√Hz)
Voltage Noise (nV/√Hz)
Channel Separation (dB)
120
TYPICAL CHARACTERISTICS (Cont.)
At TA = +25°C, VS = ±6V, and RL = 10kΩ, unless otherwise noted.
INPUT BIAS CURRENT (IB) vs COMMON-MODE
VOLTAGE (VCM) TEMPERATURE = 85°C
INPUT BIAS CURRENT (IB) vs COMMON-MODE
VOLTAGE (VCM) TEMPERATURE = 25ºC
15
500
400
10
300
VS = ±5V
100
IB (pA)
IB (pA)
VS = ±5V
200
5
0
0
–100
–5
–200
–300
–10
–400
–500
–15
–6
–5
–4
–3
–2
–1
0
1
2
3
4
5
–6
6
–5
–4
–3
–2
VCM (V)
INPUT BIAS (IB) AND CURRENT
vs TEMPERATURE
–1 0
1
VCM (V)
2
3
4
5
6
PSRR vs TEMPERATURE
120
100k
10k
110
PSRR (dB)
Bias Current (pA)
IB
1k
100
10
100
90
80
1.0
70
0.1
0.01
–50
–25
0
25
50
75
100
125
150
60
–100 –75 –50 –25
175
QUIESCENT CURRENT vs TEMPERATURE
25
50
75
100 125 150 175
GAIN vs TEMPERATURE
2.0
1.005
1.5
Gain (V/V)
IQ per Amplitude (mA)
0
Temperature (°C)
Temperature (°C)
1.0
1.000
0.5
0.0
–100 –75 –50 –25
0
25 50 75
Temperature (°C)
0.995
–100
100 125 150 175
0
50
100
150 ??
Temperature (°C)
BUF04701
SBOS214B
–50
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5
TYPICAL CHARACTERISTICS (Cont.)
At TA = +25°C, VS = ±6V, and RL = 10kΩ, unless otherwise noted.
THD+N vs FREQUENCY
(Gain = ±1 V/V, VOUT = 1.0Vrms, BW = 80kHz)
QUIESCENT CURRENT vs SUPPLY VOLTAGE
0.1
IQ per Amplifier (mA)
2.0
THD+N (%)
0.01
0.001
1.5
1.0
0.5
RL = 10kΩ
0.0001
0.0
1
10
100
1k
Frequency (Hz)
10k
100k
2
50
40
40
Sourcing
30
20
Sinking
10
0
–100 –75 –50 –25
5
6
7
8
9 10
Supply Voltage (V)
11
12
13
14
Sourcing
30
Sinking
20
10
0
0
25 50 75
Temperature (°C)
100 125 150 175
2
3
4
5
6
7
8
9 10
Supply Voltage (V)
11
12
13
14
OUTPUT VOLTAGE SWING vs OUTPUT CURRENT
(Sourcing)
OUTPUT VOLTAGE SWING vs OUTPUT CURRENT
(Sinking)
6.0
–5.0
Output Voltage (V)
–4.5
Output Voltage (V)
4
SHORT-CIRCUIT CURRENT vs SUPPLY VOLTAGE
50
Short-Circuit Current (mA)
Short-Circuit Current (mA)
SHORT-CIRCUIT CURRENT vs TEMPERATURE
3
85°C
125°C
25°C
–5.5
25°C
–40°C
5.5
85°C
125°C
5.0
–40°C
4.5
–6.0
0
5
10
15
Output Current (mA)
6
0
5
10
15
Output Current (mA)
BUF04701
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SBOS214B
TYPICAL CHARACTERISTICS (Cont.)
At TA = +25°C, VS = ±6V, and RL = 10kΩ, unless otherwise noted.
VOS PRODUCTION DISTRIBUTION
OVERSHOOT (%) vs CAPACITANCE
15
100
90
70
Frequency (%)
Overshoot (%)
80
60
50
40
30
10
5
20
10
0
8.0
7.0
6.0
5.0
4.0
3.0
2.0
1.0
0
–1.0
–2.0
–3.0
Load Capacitance Value (pF)
–4.0
10k
–5.0
1k
–7.0
100
–6.0
0
10
Voltage Offset (mV)
SMALL SIGNAL STEP RESPONSE
(G = +1V/V, RL = 10kΩ, CL = 15pF)
VOS DRIFT DISTRIBUTION
30
20
10mV/div
Frequency (%)
25
15
10
5
100ns/div
60
50
40
30
20
10
0
–10
–20
–30
–40
–50
0
Voltage Offset Drift (µV/°C)
2V/div
LARGE SIGNAL STEP RESPONSE
(G = +1V/V, RL = 10kΩ, CL = 15pF)
1µs/div
BUF04701
SBOS214B
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7
APPLICATIONS INFORMATION
Figure 1 shows the BUF04701 connected as a buffer. Power
supplies should be bypassed with capacitors connected
close to the device pins. Capacitor values as low as 0.1µF
will assure stable operation in most applications, but high
output current and fast output slewing can demand large
current transients from the power supplies.
Rail-to-rail input and output swing helps maintain dynamic
range, especially in low supply applications. Figure 2 shows
the input and output waveforms for the BUF04701. On a ±6V
supply with a 100kΩ load connected to VS/2, the output is
tested to swing within 50mV to the rail.
OPERATING VOLTAGE
The BUF04701 is fully specified and tested from 3.5V to 12V
over a temperature range of –40°C to +125°C. Parameters
that vary significantly with operating voltages or temperature
are shown in the Typical Characteristic Curves.
V+
0.1µF
1/4
BUF04701
VIN
RL
0.1µF
RAIL-TO-RAIL INPUT
The input common-mode voltage range of the BUF04701
extends 100mV beyond the supply rails at room temperature;
however, due to the fixed gain at G = 1, the output will
limit the useable input range. This wide swing is achieved
with a complementary input stage—an N-channel input
differential pair in parallel with a P-channel differential pair.
The N-channel pair is active for input voltages close to the
positive rail, typically (V+) – 2.0V to 100mV above the
positive supply, while the P-channel pair is on for inputs
from 100mV below the negative supply to approximately
(V+) – 1.5V. There is a small transition region, typically
(V+) – 2.0V to (V+) – 1.5V, in which both pairs are on. This
500mV transition region can vary ±100mV with process
variation. Thus, the transition region (both stages on) can
range from (V+) – 2.1V to (V+) – 1.4V on the low end, up to
(V+) – 1.9V to (V+) – 1.6V on the high end.
INPUT PROTECTION
Device inputs are protected by ESD diodes that will conduct
if the input voltages exceed the power supplies by more than
approximately 300mV. Momentary voltages greater than
300mV beyond the power supply can be tolerated if the
current is limited to 10mA. This is easily accomplished with
an input resistor, in series with the buffer input shown in
Figure 3. Many input signals are inherently current-limited to
less than 10mA; therefore, a limiting resistor is not always
required. The BUF04701 features no phase inversion when
the inputs extend beyond supplies if the input current is
limited, as shown in Figure 4.
V+
V–
RS
FIGURE 1. Basic Connections.
8
VIN
6
VOUT
V–
G = +1, VS ± 6V
Input
1/4
BUF04701
FIGURE 3. Limiting Input Current on the BUF04701.
4
2V/div
2
VS = ±6V, VIN = 13Vp-p, G = +1
0
–2
–4
2V/div
–6
Output (Inverted on oscilloscope)
–8
20µs/div
FIGURE 2. Rail-to-Rail Input and Output.
20µs/div
FIGURE 4. BUF04701—No Phase Inversion with Inputs
Greater than the Power-Supply Voltage.
8
BUF04701
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SBOS214B
RAIL-TO-RAIL OUTPUT
VDC
A class AB output stage with common-source transistors is
used to achieve rail-to-rail output. This output stage is capable of driving 1kΩ loads connected to any point between
V+ and V–. For light resistive loads (> 100kΩ), the output
voltage can swing to 100mV from the supply rail. With 2kΩ
resistive loads, the output is specified to swing to within
200mV of the supply rails while maintaining high open-loop
gain (see the typical characteristic curve Output Voltage
Swing vs Output Current).
GMA1
RS
20Ω
1/4
BUF04701
CL
100nF
GMA4
1/4
BUF04701
GMA5
CL
100nF
The BUF04701 can drive up to 1000pF pure capacitive load.
One method of improving capacitive load drive is to insert a
10 to 20Ω resistor in series with the output, as shown in
Figure 5. This reduces ringing with large capacitive loads
while maintaining DC accuracy.
1/4
BUF04701
GMA3
RS
20Ω
CAPACITIVE LOAD AND STABILITY
VIN
GMA2
GMA6
RS
20Ω
1/4
BUF04701
GMA7
CL
100nF
GMA8
GMA9
20Ω
RS
20Ω
VOUT
1/4
BUF04701
GMA10
CL
100nF
LCD Source Driver
FIGURE 5. Improving Capacitive Load Drive.
FIGURE 6. BUF04701 as LCD Display Buffer.
APPLICATION CIRCUITS
REFERENCE BUFFER FOR LCD SOURCE DRIVERS
In modern high-resolution TFT-LCD displays, gamma correction must be performed to correct for nonlinearities in the glass
transmission characteristics of the LCD panel. The typical LCD
source driver for 64 bits of grayscale uses internal Digital-toAnalog Converters (DACs) to convert the 6-bit data into analog
voltages applied to the LCD. These DACs typically require
external voltage references for proper operation. Normally
these external reference voltages are generated using a simple
resistive ladder, like the one shown in Figure 6.
Typical laptop or desktop LCD panels require 6 to 8 of the
source driver circuits in parallel to drive all columns of the
panel. Although the resistive load of one internal string of a
DAC is only around 10kΩ to 16kΩ, 6 to 8 strings in parallel
represent a very substantial load. The power supply used for
the LCD source drivers for laptops is typically in the order of
10V. To maximize the dynamic range of the DAC, rail-to-rail
output performance is required for the upper and lower buffer.
The ability of the BUF04701 to operate on 12V supplies, to
drive heavy resistive loads (as low as 2kΩ), and to swing to
within 200mV of the supply rails, makes it very well suited as
a buffer for the reference voltage inputs of LCD source drivers.
During conversion of the DAC, internal switches create
current glitches on the output of the reference buffer. The
capacitor CL (typically 100nF) functions as a charge reservoir
that provides/absorbs most of the glitch energy. The series
resistor RS isolates the outputs of the BUF04701 from the
heavy capacitive load and helps to improve settling time.
4-POLE LOW-PASS SALLEN-KEY FILTER
The high open-loop gain and wide bandwidth of the BUF04701
make it optimal for active filtering applications. Figure 7 shows
the BUF04701 in a 4-pole Butterworth low-pass active filter
configuration of 20kHz bandwidth.
2.2nF
2.18kΩ
19.4kΩ
VIN
1/4
BUF04701
6.8nF
1.68kΩ
680pF
16.8kΩ
1/4
BUF04701
VOUT
330pF
FIGURE 7. BUF04701 Configured as a 4-Pole Sallen-Key Butterworth Low-Pass Filter.
BUF04701
SBOS214B
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9
PACKAGE OPTION ADDENDUM
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6-May-2022
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)
BUF04701AIDGSR
NRND
VSSOP
DGS
10
2500
RoHS & Green
Call TI | NIPDAUAG
Level-2-260C-1 YEAR
-40 to 125
B01
(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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