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부품번호 | AD8137 기능 |
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기능 | Low Power 12-Bit Differential ADC Driver | ||
제조업체 | Analog Devices | ||
로고 | |||
전체 30 페이지수
Data Sheet
FEATURES
Fully differential
Extremely low power with power-down feature
2.6 mA quiescent supply current @ 5 V
450 µA in power-down mode @ 5 V
High speed
110 MHz large signal 3 dB bandwidth @ G = 1
450 V/µs slew rate
12-bit SFDR performance @ 500 kHz
Fast settling time: 100 ns to 0.02%
Low input offset voltage: ±2.6 mV max
Low input offset current: 0.45 µA max
Differential input and output
Differential-to-differential or single-ended-to-differential
operation
Rail-to-rail output
Adjustable output common-mode voltage
Externally adjustable gain
Wide supply voltage range: 2.7 V to 12 V
Available in small SOIC package
Qualified for automotive applications
APPLICATIONS
ADC drivers
Automotive vision and safety systems
Automotive infotainment systems
Portable instrumentation
Battery-powered applications
Single-ended-to-differential converters
Differential active filters
Video amplifiers
Level shifters
GENERAL DESCRIPTON
The AD8137 is a low cost differential driver with a rail-to-rail
output that is ideal for driving ADCs in systems that are sensitive
to power and cost. The AD8137 is easy to apply, and its internal
common-mode feedback architecture allows its output common-
mode voltage to be controlled by the voltage applied to one pin.
The internal feedback loop also provides inherently balanced
outputs as well as suppression of even-order harmonic distortion
products. Fully differential and single-ended-to-differential gain
configurations are easily realized by the AD8137. External
feedback networks consisting of four resistors determine the
Low Cost, Low Power,
Differential ADC Driver
AD8137
FUNCTIONAL BLOCK DIAGRAM
–IN 1
VOCM 2
VS+ 3
+OUT 4
AD8137
8 +IN
7 PD
6 VS–
5 –OUT
Figure 1.
3
2 G=1
1
0
–1 G = 2
G=5
–2
–3
–4
–5
–6 G = 10
–7
–8
–9
–10 RG = 1kΩ
–11 VO, dm = 0.1V p-p
–12
0.1 1
10
FREQUENCY (MHz)
100
Figure 2. Small Signal Response for Various Gains
1000
closed-loop gain of the amplifier. The power-down feature is
beneficial in critical low power applications.
The AD8137 is manufactured on Analog Devices, Inc.,
proprietary second-generation XFCB process, enabling it to
achieve high levels of performance with very low power
consumption.
The AD8137 is available in the small 8-lead SOIC package and
3 mm × 3 mm LFCSP package. It is rated to operate over the
extended industrial temperature range of −40°C to +125°C.
Rev. E
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113 ©2004–2012 Analog Devices, Inc. All rights reserved.
Data Sheet
AD8137
SPECIFICATIONS
VS = ±5 V, VOCM = 0 V (@ 25°C, differential gain = 1, RL, dm = RF = RG = 1 kΩ, unless otherwise noted, TMIN to TMAX = −40°C to +125°C).
Table 1.
Parameter
DIFFERENTIAL INPUT PERFORMANCE
Dynamic Performance
−3 dB Small Signal Bandwidth
−3 dB Large Signal Bandwidth
Slew Rate
Settling Time to 0.02%
Overdrive Recovery Time
Noise/Harmonic Performance
Conditions
VO, dm = 0.1 V p-p
AD8137W only: TMIN-TMAX
VO, dm = 2 V p-p
AD8137W only: TMIN-TMAX
VO, dm = 2 V step
VO, dm = 3.5 V step
G = 2, VI, dm = 12 V p-p triangle wave
Min
Typ Max
Unit
64 76
63
79 110
79
450
100
85
MHz
MHz
MHz
MHz
V/µs
Ns
Ns
SFDR
Input Voltage Noise
Input Current Noise
DC Performance
Input Offset Voltage
Input Offset Voltage Drift
Input Bias Current
Input Offset Current
Open-Loop Gain
Input Characteristics
Input Common-Mode Voltage Range
Input Resistance
Input Capacitance
CMRR
Output Characteristics
Output Voltage Swing
Output Current
Output Balance Error
VOCM to VO, cm PERFORMANCE
VOCM Dynamic Performance
−3 dB Bandwidth
Slew Rate
Gain
VOCM Input Characteristics
Input Voltage Range
VO, dm = 2 V p-p, fC = 500 kHz
VO, dm = 2 V p-p, fC = 2 MHz
f = 50 kHz to 1 MHz
f = 50 kHz to 1 MHz
VIP = VIN = VOCM = 0 V
AD8137W only: TMIN-TMAX
TMIN to TMAX
TMIN to TMAX
AD8137W only: TMIN-TMAX
AD8137W only: TMIN-TMAX
Differential
Common-mode
Common-mode
ΔVICM = ±1 V
AD8137W only: TMIN-TMAX
Each single-ended output, RL, dm = 1 kΩ
AD8137W only: TMIN-TMAX
f = 1 MHz
VO, cm = 0.1 V p-p
VO, cm = 0.5 V p-p
AD8137W only: TMIN-TMAX
AD8137W only: TMIN-TMAX
90
76
8.25
1
−2.6 ±0.7
−5.0
3
0.5
0.1
91
−4
−4
800
400
1.8
66 79
66
VS− + 0.55
VS− + 0.55
20
−64
0.992
0.990
−4
−4
58
63
1.000
dB
dB
nV/√Hz
pA/√Hz
+2.6 mV
+5.0 mV
µV/°C
1.0 µA
0.45 µA
0.45 µA
dB
+4 V
+4 V
KΩ
KΩ
pF
dB
dB
VS+ − 0.55
VS+ − 0.55
V
V
mA
dB
1.008
1.008
+4
+4
MHz
V/µs
V/V
V/V
V
V
Input Resistance
Input Offset Voltage
Input Voltage Noise
AD8137W only: TMIN-TMAX
f = 100 kHz to 1 MHz
35 kΩ
−28 ±11 +28 mV
−28 +28 mV
18 nV/√Hz
Rev. E | Page 3 of 32
4페이지 AD8137
Parameter
Input Voltage Noise
Input Bias Current
CMRR
Power Supply
Operating Range
Quiescent Current
Quiescent Current, Disabled
PSRR
PD Pin
Threshold Voltage
Input Current
OPERATING TEMPERATURE RANGE
Conditions
f = 100 kHz to 5 MHz
AD8137W only: TMIN-TMAX
ΔVO, dm /ΔVOCM, ΔVOCM = ±0.5 V
AD8137W only: TMIN-TMAX
AD8137W only: TMIN-TMAX
AD8137W only: TMIN-TMAX
Power-down = low
AD8137W only: TMIN-TMAX
ΔVS = ±1 V
AD8137W only: TMIN-TMAX
AD8137W only: TMIN-TMAX
Power-down = high/low
AD8137W only: TMIN-TMAX
Data Sheet
Min
62
62
+2.7
+2.7
79
79
VS− + 0.7
VS− + 0.7
−40
Typ Max
18
0.25 0.9
0.9
75
±6
±6
2.6 2.8
2.8
450 600
600
91
50/110
VS− + 1.5
VS− + 1.5
60/120
60/125
+125
Unit
nV/√Hz
µA
µA
dB
dB
V
V
mA
mA
µA
µA
dB
dB
V
V
µA
µA
°C
Rev. E | Page 6 of 32
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