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Preliminary Technical Data
FEATURES
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/s 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
Low Distortion Ultrahigh Speed Differential ADC Driver ADA4960-1
PIN CONFIGURATION
APPLICATIONS
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
Figure 1.
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). 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 k differential input resistance for gains of 6 dB to 15 dB, easing matching and input drive requirements. The ADA4960-1 has a nominal 150 differential output resistance. 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.
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. 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 x3 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 -40C to +105C.
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 (c)2009 Analog Devices, Inc. All rights reserved.
ADA4960-1 TABLE OF CONTENTS
Features .............................................................................................. 1 Applications ....................................................................................... 1 Pin Configuration ............................................................................. 1 General Description ......................................................................... 1
Preliminary Technical Data
Revision History ................................................................................2 Specifications .....................................................................................3 Pin Configuration and Function Description ...............................5 Outline Dimensions ..........................................................................6
REVISION HISTORY
12/09--Revision PrA: Preliminary Version
Rev. PrB | Page 2 of 6
Preliminary Technical Data SPECIFICATIONS
VS = +5V, VOCM = +2.5V, RL, dm = 100, @ 25C, unless otherwise noted. TMIN to TMAX = -40C to +105C. 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 Conditions Min Typ Max
ADA4960-1
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 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 VIP = VIN = VOCM =0 V TMIN to TMAX TMIN to TMAX
3000 8000
MHz MHz V/s ns ns dBc dBc dBc dBc dBc dBc dBc nV/Hz pA/Hz V V/C A A dB
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
-77/-67 -69/63 -52/-63 -80/-67 -70/-63 -58/-69 67 3.6 3
Vs/20.25 Differential (DC Fin 1GHz) Common-Mode Common-Mode VICM = 1 V dc
Vs/2 10
Vs/2+ 0.25
V K M pF dB V pk-pk Differential V
3.5 Each Single-Ended Output, RL, dm = Open Circuit Each Single-Ended Output
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
150
VO, cm = 0.1 V p-p VO, cm = 2 V p-p
MHz V/s V/V V M mV nV/Hz A dB
VOS, cm = VO, cm - VOCM; VIP = VIN = VOCM = 2.5 V f = 100 KHz VOCM/VO(dm), VOCM = 1 V
Rev. PrB | Page 3 of 6
ADA4960-1
Parameter POWER SUPPLY Operating Range Quiescent Current +PSRR -PSRR OPERATING TEMPERATURE RANGE Conditions Min
Preliminary Technical Data
Typ 5 60 Change in +VS = 1 V Change in -VS = 1 V -40 +105 Max Unit V mA dB dB C
Rev. PrB | Page 4 of 6
Preliminary Technical Data PIN CONFIGURATION AND FUNCTION DESCRIPTION
ADA4960-1
Figure 2. Pin Configuration
Table 2. Pin Function Descriptions
Pin No. 1 2 3 4 5 6 7, 8, 9, 12 10 11 13 Mnemonic VIP IIP IIN VIN VCIO VCI +Vs VON VOP VC0M 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. 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 F 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.
16 13, 14, 15, 16
PD GND
Rev. PrB | Page 5 of 6
ADA4960-1 OUTLINE DIMENSIONS
3.00 BSC SQ 0.45 PIN 1 INDICATOR TOP VIEW 2.75 BSC SQ 0.50 BSC 12 MAX 1.00 0.85 0.80 SEATING PLANE 0.30 0.23 0.18 0.80 MAX 0.65 TYP 0.05 MAX 0.02 NOM 0.20 REF 1.50 REF
9 8
Preliminary Technical Data
0.60 MAX
0.50 0.40 0.30
PIN 1 INDICATOR *1.45 1.30 SQ 1.15
13 16 12 (BOTTOM VIEW) 1
EXPOSED PAD
5
4
0.25 MIN
FOR PROPER CONNECTION OF THE EXPOSED PAD, REFER TO THE PIN CONFIGURATION AND FUNCTION DESCRIPTIONS SECTION OF THIS DATA SHEET.
*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 x 3 mm Body, Very Thin Quad (CP-16-2) Dimensions shown in millimeters
(c)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

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