12-Bit, 65 MSPS
IF Sampling A/D Converter
a
AD6640
FEATURES
FUNCTIO NAL BLO CK D IAGRAM
65 MSPS Minim um Sam ple Rate
80 dB Spurious-Free Dynam ic Range
IF-Sam pling to 70 MHz
AV
DV
CC
CC
710 m W Pow er Dissipation
Single +5 V Supply
AIN
A
TH1
TH2
TH3
BUF
ADC
AIN
On-Chip T/ H and Reference
Tw os Com plem ent Output Form at
3.3 V or 5 V CMOS-Com patible Output Levels
+2.4V
REFERENCE
ADC
DAC
7
V
AD6640
REF
6
ENCODE
INTERNAL
TIMING
DIGITAL ERROR CORRECTION LOGIC
ENCODE
APPLICATIONS
MSB
LSB
Cellular/ PCS Base Stations
Multichannel, Multim ode Receivers
GPS Anti-J am m ing Receivers
Com m unications Receivers
Phased Array Receivers
D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
GND
P RO D UCT D ESCRIP TIO N
P RO D UCT H IGH LIGH TS
T he 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.
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.
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 MH z.
Noise performance is also exceptional; typical signal-to-noise
ratio is 68 dB.
5. Complete Solution: reference and track-and-hold.
6. Packaged in small, surface mount, plastic 44-terminal TQFP.
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 T hin
Quad Flatpack (T QFP) specified from –40°C to +85°C.
REV. 0
Inform ation furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assum ed by Analog Devices for its
use, nor for any infringem ents of patents or other rights of third parties
which m ay result from its use. No license is granted by im plication or
otherwise under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norw ood, MA 02062-9106, U.S.A.
Tel: 781/ 329-4700
Fax: 781/ 326-8703
World Wide Web Site: http:/ / w w w .analog.com
© Analog Devices, Inc., 1998