Low Power
Differential ADC Driver
ADA4932-1/ADA4932-2
FEATURES
High performance at low power
High speed
−3 dB bandwidth of 560 MHz, G = 1
0.1 dB gain flatness to 300 MHz
Slew rate: 2800 V/μs, 25% to 75%
Fast 0.1% settling time of 9 ns
Low power: 9.6 mA per amplifier
Low harmonic distortion
100 dB SFDR @ 10 MHz
90 dB SFDR @ 20 MHz
Low input voltage noise: 3.6 nV/√Hz
±0.5 mV typical input offset voltage
Externally adjustable gain
Can be used with fractional differential gains
Differential-to-differential or single-ended-to-differential
operation
Adjustable output common-mode voltage
Input common-mode range shifted down by 1 V
BE
Wide supply range: +3 V to ±5 V
Available in 16-lead and 24-lead LFCSP packages
FUNCTIONAL BLOCK DIAGRAMS
16 –V
S
15 –V
S
13 –V
S
12 PD
11 –OUT
10 +OUT
9 V
OCM
–FB 1
+IN 2
–IN 3
+FB 4
ADA4932-1
14 –V
S
+V
S
7
+V
S
8
+V
S
5
Figure 1. ADA4932-1
+IN1
–FB1
–V
S1
–V
S1
PD1
–OUT1
–IN1
+FB1
+V
S1
+V
S1
–FB2
+IN2
1
2
3
4
5
6
24
23
22
21
20
19
+V
S
6
ADA4932-2
18
17
16
15
14
13
+OUT1
V
OCM1
–V
S2
–V
S2
PD2
–OUT2
–IN2
+FB2
+V
S2
+V
S2
V
OCM2
+OUT2
7
8
9
10
11
12
07752-001
APPLICATIONS
ADC drivers
Single-ended-to-differential converters
IF and baseband gain blocks
Differential buffers
Line drivers
–40
–50
HARMONIC DISTORTION (dBc)
Figure 2. ADA4932-2
V
OUT, dm
= 2V p-p
HD2,
HD3,
HD2,
HD3,
G
G
G
G
=1
=1
=2
=2
–60
–70
–80
–90
–100
–110
–120
–130
–140
100k
GENERAL DESCRIPTION
The ADA4932-x is the next generation AD8132 with higher
performance, and lower noise and power consumption. It is an
ideal choice for driving high performance ADCs as a single-ended-
to-differential or differential-to-differential amplifier. The output
common-mode voltage is user adjustable by means of an internal
common-mode feedback loop, allowing the ADA4932-x output
to match the input of the ADC. The internal feedback loop also
provides exceptional output balance as well as suppression of
even-order harmonic distortion products.
With the ADA4932-x, differential gain configurations are easily
realized with a simple external four-resistor feedback network that
determines the closed-loop gain of the amplifier.
The ADA4932-x is fabricated using the Analog Devices, Inc.,
proprietary silicon-germanium (SiGe) complementary bipolar
process, enabling it to achieve low levels of distortion and noise
at low power consumption. The low offset and excellent dynamic
performance of the ADA4932-x make it well suited for a wide
variety of data acquisition and signal processing applications.
Rev. A
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.
Trademarks and registered trademarks are the property of their respective owners.
07752-002
1M
10M
FREQUENCY (Hz)
100M
Figure 3. Harmonic Distortion vs. Frequency at Various Gains
The ADA4932-x is available in a Pb-free, 3 mm × 3 mm 16-lead
LFCSP (ADA4932-1, single) or a Pb-free, 4 mm × 4 mm 24-lead
LFCSP (ADA4932-2, dual). The pinout has been optimized to
facilitate PCB layout and minimize distortion. The ADA4932-1
and the ADA4932-2 are specified to operate over the −40°C to
+105°C temperature range; both operate on supplies between
+3 V and ±5 V.
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 ©2008–2009 Analog Devices, Inc. All rights reserved.
07752-003
ADA4932-1/ADA4932-2
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications ....................................................................................... 1
General Description ......................................................................... 1
Functional Block Diagrams ............................................................. 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
±5 V Operation ............................................................................. 3
5 V Operation ............................................................................... 5
Absolute Maximum Ratings............................................................ 7
Thermal Resistance ...................................................................... 7
Maximum Power Dissipation ..................................................... 7
ESD Caution .................................................................................. 7
Pin Configurations and Function Descriptions ........................... 8
Typical Performance Characteristics ............................................. 9
Test Circuits ..................................................................................... 17
Terminology .................................................................................... 18
Theory of Operation ...................................................................... 19
Applications Information .............................................................. 20
Analyzing an Application Circuit ............................................ 20
Setting the Closed-Loop Gain .................................................. 20
Estimating the Output Noise Voltage ...................................... 20
Impact of Mismatches in the Feedback Networks ................. 21
Calculating the Input Impedance for an Application
Circuit .......................................................................................... 21
Input Common-Mode Voltage Range ..................................... 23
Input and Output Capacitive AC Coupling ............................ 23
Setting the Output Common-Mode Voltage .......................... 23
Layout, Grounding, and Bypassing .............................................. 24
High Performance ADC Driving ................................................. 25
Outline Dimensions ....................................................................... 26
Ordering Guide .......................................................................... 26
REVISION HISTORY
8/09—Rev. 0 to Rev. A
Changes to Features Section............................................................ 1
Changes to Figure 11 ........................................................................ 9
Changes to Figure 43 and Figure 45 ............................................. 15
Changes to Figure 52, Figure 53, and Figure 54 ......................... 17
10/08—Revision 0: Initial Version
Rev. A | Page 2 of 28
ADA4932-1/ADA4932-2
SPECIFICATIONS
±5 V OPERATION
T
A
= 25°C, +V
S
= 5 V, −V
S
= −5 V, V
OCM
= 0 V, R
F
= 499 Ω, R
G
= 499 Ω, R
T
= 53.6 Ω (when used), R
L, dm
= 1 kΩ, unless otherwise noted.
All specifications refer to single-ended input and differential outputs, unless otherwise noted. Refer to Figure 55 for signal definitions.
±D
IN
to V
OUT, dm
Performance
Table 1.
Parameter
DYNAMIC PERFORMANCE
−3 dB Small Signal Bandwidth
−3 dB Large Signal Bandwidth
Bandwidth for 0.1 dB Flatness
Slew Rate
Settling Time to 0.1%
Overdrive Recovery Time
NOISE/HARMONIC PERFORMANCE
Second Harmonic
Conditions
V
OUT, dm
= 0.1 V p-p
V
OUT, dm
= 0.1 V p-p, R
F
= R
G
= 205 Ω
V
OUT, dm
= 2.0 V p-p
V
OUT, dm
= 2.0 V p-p, R
F
= R
G
= 205 Ω
V
OUT, dm
= 2.0 V p-p, ADA4932-1, R
L
= 200 Ω
V
OUT, dm
= 2.0 V p-p, ADA4932-2, R
L
= 200 Ω
V
OUT, dm
= 2 V p-p, 25% to 75%
V
OUT, dm
= 2 V step
V
IN
= 0 V to 5 V ramp, G = 2
See Figure 54 for distortion test circuit
V
OUT, dm
= 2 V p-p, 1 MHz
V
OUT, dm
= 2 V p-p, 10 MHz
V
OUT, dm
= 2 V p-p, 20 MHz
V
OUT, dm
= 2 V p-p, 50 MHz
V
OUT, dm
= 2 V p-p, 1 MHz
V
OUT, dm
= 2 V p-p, 10 MHz
V
OUT, dm
= 2 V p-p, 20 MHz
V
OUT, dm
= 2 V p-p, 50 MHz
f
1
= 30 MHz, f
2
= 30.1 MHz, V
OUT, dm
= 2 V p-p
f = 1 MHz
f = 1 MHz
f = 10 MHz, ADA4932-2
V
+DIN
= V
−DIN
= V
OCM
= 0 V
T
MIN
to T
MAX
variation
T
MIN
to T
MAX
variation
Input Offset Current
Input Resistance
Input Capacitance
Input Common-Mode Voltage Range
CMRR
Open-Loop Gain
OUTPUT CHARACTERISTICS
Output Voltage Swing
Linear Output Current
Output Balance Error
∆V
OUT, dm
/∆V
IN, cm
, ∆V
IN, cm
= ±1 V
64
Maximum ∆V
OUT
, single-ended output,
R
F
= R
G
= 10 kΩ, R
L
= 1 kΩ
200 kHz, R
L, dm
= 10 Ω, SFDR = 68 dB
∆V
OUT, cm
/∆V
OUT, dm
, ∆V
OUT, dm
= 2 V p-p, 1 MHz,
see Figure 53 for output balance test circuit
−V
S
+ 1.4 to
+V
S
− 1.4
−0.2
Differential
Common mode
−2.2
−5.2
Min
Typ
560
1000
360
360
300
100
2800
9
20
−110
−100
−90
−72
−130
−120
−105
−80
−91
3.6
1.0
−100
±0.5
−3.7
−2.5
−9.5
±0.025
11
16
0.5
−V
S
+ 0.2 to
+V
S
− 1.8
−100
66
−V
S
+ 1.2 to
+V
S
− 1.2
80
−64
+2.2
−0.1
+0.2
Max
Unit
MHz
MHz
MHz
MHz
MHz
MHz
V/μs
ns
ns
dBc
dBc
dBc
dBc
dBc
dBc
dBc
dBc
dBc
nV/√Hz
pA/√Hz
dB
mV
μV/°C
μA
nA/°C
μA
MΩ
MΩ
pF
V
dB
dB
V
mA rms
dB
Third Harmonic
IMD
Voltage Noise (RTI)
Input Current Noise
Crosstalk
INPUT CHARACTERISTICS
Offset Voltage
Input Bias Current
−87
−60
Rev. A | Page 3 of 28
ADA4932-1/ADA4932-2
V
OCM
to V
OUT, cm
Performance
Table 2.
Parameter
V
OCM
DYNAMIC PERFORMANCE
−3 dB Small Signal Bandwidth
−3 dB Large Signal Bandwidth
Slew Rate
Input Voltage Noise (RTI)
V
OCM
INPUT CHARACTERISTICS
Input Voltage Range
Input Resistance
Input Offset Voltage
V
OCM
CMRR
Gain
Conditions
V
OUT, cm
= 100 mV p-p
V
OUT, cm
= 2 V p-p
V
IN
= 1.5 V to 3.5 V, 25% to 75%
f = 1 MHz
Min
Typ
270
105
410
9.6
−V
S
+ 1.2 to +V
S
− 1.2
25
±1
−100
0.998
Max
Unit
MHz
MHz
V/μs
nV/√Hz
V
kΩ
mV
dB
V/V
V
+DIN
= V
−DIN
= 0 V
ΔV
OUT, dm
/ΔV
OCM
, ΔV
OCM
= ±1 V
ΔV
OUT, cm
/ΔV
OCM
, ΔV
OCM
= ±1 V
22
−5.1
0.995
29
+5.1
−86
1.000
General Performance
Table 3.
Parameter
POWER SUPPLY
Operating Range
Quiescent Current per Amplifier
Conditions
Min
3.0
9.0
T
MIN
to T
MAX
variation
Powered down
ΔV
OUT, dm
/ΔV
S
, ΔV
S
= 1 V p-p
Powered down
Enabled
Typ
Max
11
10.1
1.0
−84
Unit
V
mA
μA/°C
mA
dB
V
V
ns
ns
+10
−140
+105
μA
μA
°C
Power Supply Rejection Ratio
POWER-DOWN (PD)
PD Input Voltage
Turn-Off Time
Turn-On Time
PD Pin Bias Current per Amplifier
Enabled
Disabled
OPERATING TEMPERATURE RANGE
9.6
35
0.9
−96
≤(+V
S
− 2.5)
≥(+V
S
− 1.8)
1100
16
PD = 5 V
PD = 0 V
−10
−240
−40
+0.7
−195
Rev. A | Page 4 of 28
ADA4932-1/ADA4932-2
5 V OPERATION
T
A
= 25°C, +V
S
= 5 V, −V
S
= 0 V, V
OCM
= 2.5 V, R
F
= 499 Ω, R
G
= 499 Ω, R
T
= 53.6 Ω (when used), R
L, dm
= 1 kΩ, unless otherwise noted.
All specifications refer to single-ended input and differential outputs, unless otherwise noted. Refer to Figure 55 for signal definitions.
±D
IN
to V
OUT, dm
Performance
Table 4.
Parameter
DYNAMIC PERFORMANCE
−3 dB Small Signal Bandwidth
−3 dB Large Signal Bandwidth
Bandwidth for 0.1 dB Flatness
Slew Rate
Settling Time to 0.1%
Overdrive Recovery Time
NOISE/HARMONIC PERFORMANCE
Second Harmonic
Conditions
V
OUT, dm
= 0.1 V p-p
V
OUT, dm
= 0.1 V p-p, R
F
= R
G
= 205 Ω
V
OUT, dm
= 2.0 V p-p
V
OUT, dm
= 2.0 V p-p, R
F
= R
G
= 205 Ω
V
OUT, dm
= 2.0 V p-p, ADA4932-1, R
L
= 200 Ω
V
OUT, dm
= 2.0 V p-p, ADA4932-2, R
L
= 200 Ω
V
OUT, dm
= 2 V p-p, 25% to 75%
V
OUT, dm
= 2 V step
V
IN
= 0 V to 2.5 V ramp, G = 2
See Figure 54 for distortion test circuit
V
OUT, dm
= 2 V p-p, 1 MHz
V
OUT, dm
= 2 V p-p, 10 MHz
V
OUT, dm
= 2 V p-p, 20 MHz
V
OUT, dm
= 2 V p-p, 50 MHz
V
OUT, dm
= 2 V p-p, 1 MHz
V
OUT, dm
= 2 V p-p, 10 MHz
V
OUT, dm
= 2 V p-p, 20 MHz
V
OUT, dm
= 2 V p-p, 50 MHz
f
1
= 30 MHz, f
2
= 30.1 MHz, V
OUT, dm
= 2 V p-p
f = 1 MHz
f = 1 MHz
f = 10 MHz, ADA4932-2
V
+DIN
= V
−DIN
= V
OCM
= 2.5 V
T
MIN
to T
MAX
variation
T
MIN
to T
MAX
variation
Input Offset Current
Input Resistance
Input Capacitance
Input Common-Mode Voltage Range
CMRR
Open-Loop Gain
OUTPUT CHARACTERISTICS
Output Voltage Swing
Linear Output Current
Output Balance Error
∆V
OUT, dm
/∆V
IN, cm
, ∆V
IN, cm
= ±1 V
64
Maximum ∆V
OUT
, single-ended output,
R
F
= R
G
= 10 kΩ, R
L
= 1 kΩ
200 kHz, R
L, dm
= 10 Ω, SFDR = 67 dB
∆V
OUT, cm
/∆V
OUT, dm
, ∆V
OUT, dm
= 1 V p-p, 1 MHz,
see Figure 53 for output balance test circuit
−V
S
+ 1.15 to
+V
S
− 1.15
−0.25
Differential
Common mode
−2.2
−5.3
Min
Typ
560
990
315
320
120
200
2200
10
20
−110
−100
−90
−72
−120
−100
−87
−70
−91
3.6
1.0
−100
±0.5
−3.7
−3.0
−9.5
±0.025
11
16
0.5
−V
S
+ 0.2 to
+V
S
− 1.8
−100
66
−V
S
+ 1.02 to
+V
S
− 1.02
53
−64
+2.2
−0.23
+0.25
Max
Unit
MHz
MHz
MHz
MHz
MHz
MHz
V/μs
ns
ns
dBc
dBc
dBc
dBc
dBc
dBc
dBc
dBc
dBc
nV/√Hz
pA/√Hz
dB
mV
μV/°C
μA
nA/°C
μA
MΩ
MΩ
pF
V
dB
dB
V
mA rms
dB
Third Harmonic
IMD
Voltage Noise (RTI)
Input Current Noise
Crosstalk
INPUT CHARACTERISTICS
Offset Voltage
Input Bias Current
−87
−60
Rev. A | Page 5 of 28
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