ANALOG DEVICES ADA4937-1 Service Manual
查询ADA4937-1YCPZ-R2供应商
Ultra-Low Distortion
Preliminary Technical Data
FEATURES
Extremely low harmonic distortion
−100 dBc SFDR @ 10 MHz
−81 dBc SFDR @ 70 MHz
−72 dBc SFDR @ 100 MHz
Low input voltage noise: 2.2 nV/√Hz
High speed
−3 dB bandwidth of 1.6 GHz, G = 1
Slew rate: 5000 V/μs
0.1 dB gain flatness to 125 MHz
Fast settling to 0.01% in 8 ns
Fast overdrive recovery of 4 ns
1 mV typical offset voltage
Externally adjustable gain
Differential to differential or single-ended to differential
operation
Adjustable output common-mode voltage
Single supply operation: +3.3 V to +5 V
Pb-free 3 mm x 3 mm LFCSP package
APPLICATIONS
ADC drivers
Single-ended-to-differential converters
IF and baseband gain blocks
Differential buffers
Line drivers
Differential ADC Driver
ADA4937-1
FUNCTIONAL BLOCK DIAGRAM
+
–
Figure 1.
GENERAL DESCRIPTION
The ADA4937-1 is a low noise, ultra-low distortion, high speed
differential amplifier. It is an ideal choice for driving high
performance ADCs with resolutions up to 16 bits from dc to
100 MHz. The adjustable level of the output common mode
allows the ADA4937-1 to match the input of the ADC. The
internal common mode feedback loop also provides exceptional
output balance as well as suppression of even-order harmonic
distortion products.
Full differential and single-ended to differential gain
configurations are easily realized with the ADA4937-1. A
Rev. PrA
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Anal og Devices for its use, nor for any infringements of patents or ot her
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.
Trademarks and registered trademarks are the property of their respective owners.
simple external feedback network of four resistors determines
the amplifier’s closed-loop gain.
The ADA4937-1 is fabricated using ADI’s proprietary third
generation XFCB process, enabling it to achieve very low levels
of distortion with input voltage noise of only 2.2 nV/√Hz. The
low dc offset and excellent dynamic performance of the
ADA4937-1 make it well suited for a wide variety of data
acquisition and signal processing and applications.
The ADA4937-1 is available in a Pb-free, 3 mm x 3mm lead
frame chip scale package (LFCSP). It is specified to operate
over the temperature range of −40°C to +105°C.
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 ©2006 Analog Devices, Inc. All rights reserved.
ADA4937-1 Preliminary Technical Data
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications....................................................................................... 1
Functional Block Diagram .............................................................. 1
General Description......................................................................... 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
5 V Operation ............................................................................... 3
REVISION HISTORY
12/06—Revision PrA: Initial Version
3.3 V Operation.............................................................................5
Absolute Maximum Ratings ............................................................7
Thermal Resistance.......................................................................7
ESD Caution...................................................................................7
Pin Configuration and Function Descriptions..............................8
Outline Dimensions ..........................................................................9
Ordering Guide .............................................................................9
Rev. PrA | Page 2 of 9
Preliminary Technical Data ADA4937-1
SPECIFICATIONS
5 V OPERATION
At 25°C, +VS = 5 V, -VS = 0 V, V
single-ended input and differential outputs, unless otherwise noted.
Table 1.
Parameter Conditions Min Typ Max Unit
±DIN TO ±OUT PERFORMANCE
DYNAMIC PERFORMANCE
−3 dB Small Signal Bandwidth V
Bandwidth for 0.1 dB Flatness V
Large Signal Bandwidth V
V
Slew Rate V
Settling Time 0.01%, V
Overdrive Recovery Time VIN = 2.5 V to 0 V step, G = +2 4 ns
NOISE/HARMONIC PERFORMANCE
Second Harmonic V
V
V
Third Harmonic V
V
V
IMD 70 MHz dBc
IP3 70 MHz dBm
Voltage Noise (RTI) 2.2 nV/√Hz
Noise Figure G = +2 12 dB
Input Current Noise 3 pA/√Hz
INPUT CHARACTERISTICS
Offset Voltage V
T
Input Bias Current −50 −17 μA
T
Input Resistance Differential 6 MΩ
Common mode 3 MΩ
Input Capacitance 1 pF
Input Common-Mode Voltage 0.3 to 3.0 V
CMRR ∆V
OUTPUT CHARACTERISTICS
Output Voltage Swing Maximum ∆V
Output Current 95 mA
Output Balance Error ∆V
V
to ±OUT PERFORMANCE
OCM
V
DYNAMIC PERFORMANCE
OCM
−3 dB Bandwidth 250 MHz
Slew Rate 1300 V/μs
INPUT VOLTAGE NOISE (RTI) 7.5 nV/√Hz
V
INPUT CHARACTERISTICS
OCM
Input Voltage Range 1.2 3.8 V
Input Resistance 10 kΩ
Input Offset Voltage V
Input Bias Current 0.5 μA
V
CMRR ∆V
OCM
= 2.5 V, RG = RF = 200 , G = +1, R
OCM
= 0.5 V p-p, Differential Input 1600 MHz
OUT
= 2 V p-p, Differential Input 125 MHz
OUT
= 2 V p-p, Differential Input 1400 MHz
OUT
= 4 V p-p, Differential Input 500 MHz
OUT
= 2 V p-p 5000 V/μs
OUT
= 2 Vp-p 8 ns
OUT
1
= 2 V p-p, 10 MHz −121 dBc
OUT
= 2 V p-p, 70 MHz −81 dBc
OUT
= 2 V p-p, 100 MHz −72 dBc
OUT
= 2 V p-p, 10 MHz −100 dBc
OUT
= 2 V p-p, 70 MHz −86 dBc
OUT
= 2 V p-p, 100 MHz −81 dBc
OUT
OS, dm
MIN
MIN
OUT, dm
OUT, cm
OS, cm
OUT, dm
= V
to T
to T
= V
/2; V
OUT, dm
variation ±4 μV/°C
MAX
variation −0.01 μA/°C
MAX
/∆V
; ∆V
IN, cm
; single-ended output 1 4 V
OUT
/∆V
/∆V
; ∆V
OUT, dm
; V
OUT, cm
DIN+
; ∆V
OCM
Rev. PrA | Page 3 of 9
OCM
= 1 kΩ, unless otherwise noted. All specifications refer to
L, dm
= V
DIN+
IN, cm
OUT, dm
= V
= 2.5 V 1 mV
DIN−
= ±1 V −72 dB
= 1 V; 10 MHz −56 dB
= 2.5 V 1 3.5 mV
DIN–
= ±1 V −75 dB
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