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a FEATURES Two Matched ADCs on Single Chip CMOS Compatible I/O Low Power (400 mW) Dissipation Single +5 V Supply On-Chip Voltage Reference Self-Biased for AC Coupled Inputs 28-Pin SOIC Package APPLICATIONS Direct Broadcast Satellite (DBS) Receivers QAM Demodulators Wireless LANs VSAT Receivers

Dual 6-Bit, 60 MSPS Monolithic A/D Converter AD9066 FUNCTIONAL BLOCK DIAGRAM +VS

VT 6-BIT ADC D0A-D5A

INA

REF A ENCODE 6-BIT ADC D0B-D5B

INB

REF B VB

PRODUCT DESCRIPTION

The AD9066 is a dual 6-bit ADC that has been optimized for low cost in-phase and quadrature (I&Q) demodulators. Primary applications include digital direct broadcast satellite applications where broadband quadrature phase shift keying (QPSK) modulation is used. In these receivers the recovered signal is separated into I&Q vector components and digitized. To reduce total system cost and power dissipation, the AD9066 provides an internal voltage reference and operates from a single +5 volt power supply. Digital outputs are CMOS compatible and rated to 60 MSPS conversion rates. The digital input (ENCODE) utilizes a CMOS input stage with a TTL compatible (1.4 V) threshold. The AD9066 is housed in a 28-pin SOIC package and available in two temperature grades. The AD9066JR is rated for operation over the 0°C to +70°C commercial temperature range. The AD9066AR is rated for the –40°C to +85°C industrial temperature range. The internal voltage reference insures that the analog input is biased to midscale with low offset when driven from an ac coupled source. In dc coupled applications, the midscale voltage reference can be used to control external biasing amplifiers to minimize offsets due to variations in temperature or supply voltage.

PIN CONFIGURATION ENCODE

1

28 D5A (MSB)

+VS

2

27 D4A

GND

3

26 D3A

GND

4

25 D2A

+VS

5

24 D1A

INA

6

GND

7

+VS

8

VT

9

REF A 10

23 D0A (LSB)

AD9066 TOP VIEW (Not to Scale)

22 GND 21 +VS 20 D5B (MSB) 19 D4B

INB 11

18 D3B

REF B 12

17 D2B

VB 13

16 D1B

NC 14

15 D0B (LSB)

NC = NO CONNECT

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.

© Analog Devices, Inc., 1995 One Technology Way, P.O. Box 9106, Norwood. MA 02062-9106, U.S.A. Tel: 617/329-4700 Fax: 617/326-8703


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