FUNCTIONAL BLOCK DIAGRAM
6-BIT
DAC
6-BIT
DAC
AD9066
D0A-D5A
D0B-D5B
+V
S
VT
INA
REF A
ENCODE
INB
REF B
VB
REV.A
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a
Dual 6-Bit, 60 MSPS
Monolithic A/D Converter
AD9066
PRODUCT DESCRIPTION
The AD9066 is a dual 6-bit ADC that has been optimized for
low-cost in-phase and quadrature (I and 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 and 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 com-
patible 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-lead SOIC and a 28-lead SSOP
package and is available in two temperature grades. The
AD9066JR is rated for operation over the 0°C to 70°C commer-
cial temperature range. The AD9066AR/ARS 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.
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-Lead SOIC and SSOP Packages
APPLICATIONS
Direct Broadcast Satellite (DBS) Receivers
QAM Demodulators
Wireless LANs
VSAT Receivers
PIN CONFIGURATIONS
TOP VIEW
(Not to Scale)
28
27
26
25
24
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21
20
19
18
17
16
15
1
2
3
4
5
6
7
8
9
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11
12
13
14
AD9066
(JR/AR)
ENCODE D5A (MSB)
+V
S
D4A
GND D3A
GND D2A
+V
S
D1A
INA D0A (LSB)
GND GND
+V
S
+V
S
VT D5B (MSB)
REF A D4B
INB D3B
REF B D2B
VB D1B
NC D0B (LSB)
NC = NO CONNECT
TOP VIEW
(Not to Scale)
28
27
26
25
24
23
22
21
20
19
18
17
16
15
1
2
3
4
5
6
7
8
9
10
11
12
13
14
AD9066
(ARS)
ENCODE
D5A (MSB)
+V
S
D4A
D3A
D2A
D1A
INA
D0A (LSB)
GND
+V
S
+V
S
VT
(MSB) D5B
REF A
D4B
INB
D3B
REF B
D2B
VB
D1B
NC
(LSB) D0B
GND
GND
+V
S
GND
NC = NO CONNECT
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Tel: 781/329-4700 World Wide Web Site: http://www.analog.com
Fax: 781/326-8703 © Analog Devices, Inc., 2000