a
FEATURES
65 MSPS Minimum Sample Rate
80 dB Spurious-Free Dynamic Range
IF-Sampling to 70 MHz
710 mW Power Dissipation
Single +5 V Supply
On-Chip T/H and Reference
Twos Complement Output Format
3.3 V or 5 V CMOS-Compatible Output Levels
APPLICATIONS
Cellular/PCS Base Stations
Multichannel, Multimode Receivers
GPS Anti-Jamming Receivers
Communications Receivers
Phased Array Receivers
PRODUCT DESCRIPTION
AIN
AIN
V
REF
ENCODE
ENCODE
12-Bit, 65 MSPS
IF Sampling A/D Converter
AD6640
FUNCTIONAL BLOCK DIAGRAM
AV
CC
DV
CC
BUF
TH1
TH2
TH3
A
ADC
+2.4V
REFERENCE
INTERNAL
TIMING
ADC
6
DAC
AD6640
7
DIGITAL ERROR CORRECTION LOGIC
MSB
LSB
D11
D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
GND
PRODUCT HIGHLIGHTS
The AD6640 is a high speed, high performance, low power,
monolithic 12-bit analog-to-digital converter. All necessary
functions, including track-and-hold (T/H) and reference are
included on-chip to provide a complete conversion solution.
The AD6640 runs on a single +5 V supply and provides CMOS-
compatible digital outputs at 65 MSPS.
Specifically designed to address the needs of multichannel,
multimode receivers, the AD6640 maintains 80 dB spurious-
free dynamic range (SFDR) over a bandwidth of 25 MHz.
Noise performance is also exceptional; typical signal-to-noise
ratio is 68 dB.
The AD6640 is built on Analog Devices’ high speed complemen-
tary bipolar process (XFCB) and uses an innovative multipass
architecture. Units are packaged in a 44-terminal Plastic Thin
Quad Flatpack (TQFP) specified from –40°C to +85°C.
1. Guaranteed sample rate is 65 MSPS.
2. Fully differential analog input stage specified for frequencies
up to 70 MHz; enables “IF Sampling.”
3. Low power dissipation: 710 mW off a single +5 V supply.
4. Digital outputs may be run on +3.3 V supply for easy inter-
face to digital ASICs.
5. Complete Solution: reference and track-and-hold.
6. Packaged in small, surface mount, plastic 44-terminal TQFP.
REV. 0
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
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
World Wide Web Site: http://www.analog.com
Fax: 781/326-8703
© Analog Devices, Inc., 1998
AD [ ANALOG DEVICES ]
