12-Bit, 65 MSPS
IF Sampling A/D Converter
a
AD6640
FEATURES
FUNCTIONAL BLOCK DIAGRAM
65 MSPS Minimum Sample Rate
80 dB Spurious-Free Dynamic Range
IF Sampling to 70 MHz
710 mW Power Dissipation
Single 5 V Supply
AV
CC
DV
CC
AIN
A
TH3
ADC
TH1
TH2
BUF
AIN
On-Chip T/H and Reference
Twos Complement Output Format
3.3 V or 5 V CMOS Compatible Output Levels
2.4V
ADC
DAC
7
V
AD6640
REF
REFERENCE
6
ENCODE
INTERNAL
TIMING
DIGITAL ERROR CORRECTION LOGIC
ENCODE
APPLICATIONS
LSB
MSB
Cellular/PCS Base Stations
Multichannel, Multimode Receivers
GPS Anti-Jamming Receivers
Communications Receivers
Phased Array Receivers
GND
D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
GENERAL DESCRIPTION
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.
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 interface
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 MHz.
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 44-lead plastic LQFP.
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-lead plastic quad flatpack
(LQFP) specified from –40°C to +85°C.
REV. A
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