AD ADA4960-1 Low distortion ultrahigh speed differential adc driver Datasheet

Preliminary Technical Data
FEATURES
Low Distortion Ultrahigh Speed
Differential ADC Driver
ADA4960-1
PIN CONFIGURATION
Adjustable output common-mode voltage
Externally adjustable gain
−3 dB bandwidth of 3GHz, (all gains)
Low harmonic distortion (H2/H3 SE->DIFF)
-77/-67 dBc @ 250 MHz
-69/-63 dBc @ 500 MHz
-52/-63 dBc @ 1GHz
IMD3 @ 1GHz = 67dBc
Slew rate 8000 V/μs
Fast overdrive recovery of 1 ns
Low input voltage noise of 3.6 nV/√Hz
Low power dissipation: 60 mA quiescent current
0.1 dB gain flatness to TBD MHz
Available in 16-Lead and 24-Lead LFSCP packages
APPLICATIONS
Figure 1.
ADC drivers for giga-sample ADCs
Single-ended-to-differential converters
RF/IF gain block
Line drivers
Oscilloscopes
Satellite Communications
Data Acquisition
Electronic Surveillance and Countermeasures
GENERAL DESCRIPTION
The ADA4960-1 is a high performance differential amplifier
optimized for RF and IF applications. It achieves better than
63dB SFDR performance at frequencies up to 500 MHz, and
52dB up to 1GHz, making it an ideal driver for high speed 8-bit
to 10-bit giga-sample analog-to-digital converters (ADCs).
The device also includes a unity gain buffer, for the buffering of
DC signals such as the common-mode-input to the amplifier.
This buffer is found between pins 6 (input) and pin5 (output).
If this buffer is not used, the output can be left disconnected
and the input can be grounded.
Unlike other wideband differential amplifiers, the ADA4960-1
has buffered inputs that isolate the gain-setting resistor (RG)
from the signal inputs. As a result, the ADA4960-1 maintains a
constant 10 kΩ differential input resistance for gains of 6 dB to
15 dB, easing matching and input drive requirements. The
ADA4960-1 has a nominal 150 Ω differential output resistance.
It is ideally suited for driving not only ADCs, but also mixers,
pin diode attenuators, SAW filters, and multi-element discrete
devices, as well as buffering high frequency DACs. The device
will be available in a single channel version in 3 mm ×3 mm,
16-lead LFCSP package or a dual channel version in 4 mm x 4
mm, 24-lead LFSCP. The device operates over a temperature
range of −40°C to +105°C.
The device is optimized for wideband, low distortion performance
at frequencies up to and beyond 1 GHz. These attributes,
together with its wide gain adjust capability make this device
the amplifier of choice for general-purpose IF and broadband
applications where low distortion, noise, and power are critical.
Rev. PrB
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.
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
©2009 Analog Devices, Inc. All rights reserved.
ADA4960-1
Preliminary Technical Data
TABLE OF CONTENTS
Features .............................................................................................. 1
Revision History ................................................................................2
Applications ....................................................................................... 1
Specifications .....................................................................................3
Pin Configuration ............................................................................. 1
Pin Configuration and Function Description ...............................5
General Description ......................................................................... 1
Outline Dimensions ..........................................................................6
REVISION HISTORY
12/09—Revision PrA: Preliminary Version
Rev. PrB | Page 2 of 6
Preliminary Technical Data
ADA4960-1
SPECIFICATIONS
VS = +5V, VOCM = +2.5V, RL, dm = 100Ω, @ 25°C, unless otherwise noted. TMIN to TMAX = −40°C to +105°C.
Table 1.
Parameter
DIFFERENTIAL INPUT PERFORMANCE
DYNAMIC PERFORMANCE
−3 dB Small Signal Bandwidth
Bandwidth for 0.1 dB Flatness
Slew Rate
Settling Time to 0.1%
Overdrive Recovery Time
NOISE/HARMONIC PERFORMANCE
H2/H3 (Av = 12dB) SE->DIFF
H2/H3 (Av= 12dB) DIFF->DIFF
Third-Order IMD
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 Impedance
VOCM to VO, cm PERFORMANCE
VOCM DYNAMIC PERFORMANCE
−3 dB Bandwidth
Slew Rate
Gain
VOCM INPUT CHARACTERISTICS
Input Voltage Range
Input Resistance
Input Offset Voltage
Input Voltage Noise
Input Bias Current
CMRR
Conditions
Min
Typ
Max
3000
Unit
VO, dm = 0.1 V p-p
VO, dm = 0.1 V p-p
VO, dm = 2 V Step
VO, dm = 2 V Step
G = 2, VIN, dm = 7 V p-p Triangle Wave
8000
MHz
MHz
V/μs
ns
ns
VO, dm = 1 V p-p, fC = 250 MHz
VO, dm = 1 V p-p, fC = 500 MHz
VO, dm = 1 V p-p, fC = 1000 MHz
VO, dm = 1 V p-p, fC = 250 MHz
VO, dm = 1 V p-p, fC = 500 MHz
VO, dm = 1 V p-p, fC = 1000 MHz
VO, dm = 1 V p-p, fC = 1005 MHz ± 0.05 MHz
f = 100 kHz
f = 100 kHz
-77/-67
-69/63
-52/-63
-80/-67
-70/-63
-58/-69
67
3.6
3
dBc
dBc
dBc
dBc
dBc
dBc
dBc
nV/√Hz
pA/√Hz
VIP = VIN = VOCM =0 V
TMIN to TMAX
TMIN to TMAX
μV
μV/ºC
μA
μA
dB
Vs/20.25
Differential (DC≤ Fin ≤ 1GHz)
Common-Mode
Common-Mode
ΔVICM = ±1 V dc
Each Single-Ended Output,
RL, dm = Open Circuit
Each Single-Ended Output
VO, cm = 0.1 V p-p
VO, cm = 2 V p-p
Vs/2
Vs/2+ 0.25
V
10
KΩ
MΩ
pF
dB
3.5
V pk-pk
Differential
V
150
Ω
MHz
V/μs
V/V
VOS, cm = VO, cm − VOCM; VIP = VIN = VOCM = 2.5
V
f = 100 KHz
ΔVOCM/ΔVO(dm), ΔVOCM = ±1 V
Rev. PrB | Page 3 of 6
V
MΩ
mV
nV/√Hz
μA
dB
ADA4960-1
Parameter
POWER SUPPLY
Operating Range
Quiescent Current
+PSRR
−PSRR
OPERATING TEMPERATURE RANGE
Preliminary Technical Data
Conditions
Min
Typ
Max
Unit
+105
V
mA
dB
dB
°C
5
60
Change in +VS = ±1 V
Change in −VS = ±1 V
−40
Rev. PrB | Page 4 of 6
Preliminary Technical Data
ADA4960-1
PIN CONFIGURATION AND FUNCTION DESCRIPTION
Figure 2. Pin Configuration
Table 2. Pin Function Descriptions
Pin No.
1
2
3
4
5
6
7, 8, 9, 12
Mnemonic
VIP
IIP
IIN
VIN
VCIO
VCI
+Vs
Description
Balanced Differential Input. Biased to VCOM.
Gain setting input, positive side. A resistor from this pin to pin 3 sets the gain for the device.
Gain setting input, negative side. A resistor from this pin to pin 3 sets the gain for the device..
Balanced Differential Input. Biased to VCOM.
Common Mode buffer output.
Common Mode buffer input
Positive Supply.
10
11
13
VON
VOP
VC0M
16
13, 14, 15, 16
PD
GND
Balanced Differential Output. Biased to VCOM, typically ac-coupled.
Balanced Differential Output. Biased to VCOM, typically ac-coupled.
Common-Mode Voltage. A voltage applied to this pin sets the common-mode voltage of the input and
output. Typically decoupled to ground with a 0.1 μF capacitor. With no reference applied, input and output
common mode floats to midsupply (VCC/2).
Enable. Apply positive voltage (1.3 V < ENB < VCC) to activate device.
Ground. Connect to low impedance GND.
Rev. PrB | Page 5 of 6
ADA4960-1
Preliminary Technical Data
OUTLINE DIMENSIONS
3.00
BSC SQ
0.60 MAX
13
16
12 (BOTTOM VIEW) 1
0.45
TOP
VIEW
2.75
BSC SQ
0.80 MAX
0.65 TYP
12° MAX
SEATING
PLANE
1.30 SQ
1.15
9
8
5
4
0.25 MIN
1.50 REF
0.05 MAX
0.02 NOM
0.30
0.23
0.18
*1.45
EXPOSED
PAD
0.50
BSC
1.00
0.85
0.80
PIN 1
INDICATOR
FOR PROPER CONNECTION OF
THE EXPOSED PAD, REFER TO
THE PIN CONFIGURATION AND
FUNCTION DESCRIPTIONS
SECTION OF THIS DATA SHEET.
0.20 REF
*COMPLIANT TO JEDEC STANDARDS MO-220-VEED-2
EXCEPT FOR EXPOSED PAD DIMENSION.
Figure 3. 16-Lead Lead Frame Chip Scale Package [LFCSP_VQ]
3 mm × 3 mm Body, Very Thin Quad (CP-16-2)
Dimensions shown in millimeters
©2009 Analog Devices, Inc. All rights reserved. Trademarks and
registered trademarks are the property of their respective owners.
PR08458-0-12/09(PrB)
Rev. PrB | Page 6 of 6
072208-A
PIN 1
INDICATOR
0.50
0.40
0.30
Similar pages