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부품번호 | AD9066 기능 |
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기능 | Dual 6-Bit/ 60 MSPS Monolithic A/D Converter | ||
제조업체 | Analog Devices | ||
로고 | |||
전체 7 페이지수
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-Lead SOIC and SSOP Packages
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
AD9066
VT
INA
6-BIT
DAC
D0A-D5A
REF A
ENCODE
INB
6-BIT
DAC
D0B-D5B
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 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.
REV. A
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.
PIN CONFIGURATIONS
ENCODE 1
28 D5A (MSB)
+VS 2
GND 3
27 D4A
26 D3A
GND 4
25 D2A
+VS 5
INA 6
AD9066
(JR/AR)
24 D1A
23 D0A (LSB)
GND 7 TOP VIEW 22 GND
+VS 8 (Not to Scale) 21 +VS
VT 9
20 D5B (MSB)
REF A 10
19 D4B
INB 11
18 D3B
REF B 12
17 D2B
VB 13
16 D1B
NC 14
15 D0B (LSB)
NC = NO CONNECT
+VS 1
28 GND
VT 2
27 INA
REF A 3
INB 4
26 +VS
25 GND
REF B 5
24 GND
VB 6
AD9066
(ARS)
23 +VS
NC 7 TOP VIEW 22 ENCODE
(LSB) D0B 8 (Not to Scale) 21 D5A (MSB)
D1B 9
20 D4A
D2B 10
19 D3A
D3B 11
18 D2A
D4B 12
17 D1A
(MSB) D5B 13
16 D0A (LSB)
+VS 14
15 GND
NC = NO CONNECT
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., 2000
AD9066
5.8
ENCODE = 60MSPS
5.7
5.6
5.5
5.4
5.3
5.2
1
10
MHz
100
Figure 1. ENOB vs. Analog Input Frequency
5.8
ANALOG INPUT = 10.1MHz
5.7
5.6
5.5
5.4
Gain Variation
The full-scale input range is established by the current through
the two matched resistor ladders (620 ohms each nominal). There-
fore the gain of the ADC may be modified by forcing different
voltages across the top and bottom voltage taps (VT and VB).
The easiest way to increase the input range will be to force VB
to a lower voltage. Using an external amplifier, the voltage at VB
may be forced as low as 3.0 V (3.58 nominal). Using the pre-
viously described relationship for full scale and the internal
resistor ladder values, 3.0 V at VB will result in a nominal full-
scale input range of 705 mV.
A larger input range can be established by taking the VT voltage
all the way to the supply voltage level while pulling VB to 3.0 V.
This would force a 2 V potential across the ladder and create a
full-scale input range of 1.6 V.
Greater flexibility and improved power supply rejection can be
achieved by forcing external voltage references at both the top
and bottom of the resistor ladder.
111111
2n –2 = 62
100000
011111
5.3
5.2
10
MHz
Figure 2. ENOB vs. Encode Rate
100
USING THE AD9066
Analog Input and Voltage References
The AD9066 is optimized to allow ac coupled inputs with a full-
scale input range of 500 mV ± 5%. An LSB weight is approxi-
mately 8 mV. The full-scale input range is defined as the voltage
range that accommodates 2n – 2 codes of equally weighted LSBs
(between the first and last code transitions). For the AD9066
there are 32 codes above and below the midscale voltage of the
A see Figure 3).
The full-scale input range of the AD9066 is equal to 500/620 ×
(VT – VB), or nominally 500 mV. For dc coupled applications,
the REF A and REF B voltages can be used to feed back offset
compensation signals. This will allow the midscale transition
voltage of the ADCs to track supply and temperature variations.
In the event that offset correction signals are generated digitally,
the REF pins would not be required. Figure 4a shows the
equivalent circuit for the internal references. All component
tolerances are ± 25%.
000001
000000
–FULL-SCALE
MIDSCALE
Figure 3.
+FULL-SCALE
+VS = 5V
400⍀
VT
40k⍀
REF B
310⍀ 310⍀
310⍀ 310⍀
40k⍀
REF A
VB
2mA
a. Reference Circuit
INPUT
VS
1.4V THRESHOLD
b. Encode Input
VS
VS
OUTPUTS
40k⍀
REF
c. Output Bits
d. Analog Input
Figure 4. Equivalent Circuits
–4– REV. A
4페이지 OUTLINE DIMENSIONS
Dimensions shown in inches and (mm).
28-Lead Small Outline Package
(R-28)
28
1
PIN 1
0.7125 (18.10)
0.6969 (17.70)
15
0.2992 (7.60)
0.2914 (7.40)
0.4193 (10.65)
14 0.3937 (10.00)
0.1043 (2.65)
0.0926 (2.35)
0.0291 (0.74)
0.0098 (0.25)؋ 45؇
0.0118 (0.30)
0.0040 (0.10)
0.0500
(1.27)
BSC
8؇
0.0192 (0.49)
0.0138 (0.35)
SEATING
PLANE
0.0125
(0.32)
0.0091 (0.23)
0؇
28-Lead SSOP
(RS-28)
0.0500 (1.27)
0.0157 (0.40)
0.407 (10.34)
0.397 (10.08)
28 15
1 14
0.078 (1.98) PIN 1
0.068 (1.73)
0.07 (1.79)
0.066 (1.67)
0.008
(0.203)
0.0256
(0.65)
0.002 (0.050) BSC
8°
0.015 (0.38)
0.010 (0.25)
SEATING
PLANE
0°
0.009 (0.229)
0.005 (0.127)
0.03 (0.762)
0.022 (0.558)
AD9066
REV. A
–7–
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DataSheet.kr | 2020 | 연락처 | 링크모음 | 검색 | 사이트맵 |