参数资料
型号: AD9066ARS
厂商: ANALOG DEVICES INC
元件分类: ADC
英文描述: Dual 6-Bit, 60 MSPS Monolithic A/D Converter
中文描述: DUAL 1-CH 6-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PDSO28
封装: SSOP-28
文件页数: 6/7页
文件大小: 99K
代理商: AD9066ARS
–6–
+
+
AD9066
CLKIN
OPBPF
OR LPF
PLL
V
INA
V
INB
CLOCK
1
6
11
28
27
26
25
24
23
20
19
18
17
16
15
A OUTPUTS
(INPHASE)
B OUTPUTS
0
90
RECEIVED SIGNAL
STRENGTH INDICATOR
AGC
DETECTOR
PTAT
VOLTAGE
10
VMID
10
100nF
330
100nF
4.7 F
330
BANDPASS
FILTER
AGC VOLTAGE
MIDPOINT
BIAS
GENERATOR
BIAS
CIRCUIT
16dBM
LOCAL
OSCILLATOR
RF INPUT
(ANTENNA)
AD607
Figure 8. Digitizer with AD607 Receiver Circuit
Theory of Operation
The AD9066 dual ADC employs a patented interpolated flash
architecture. This architecture enables 64 possible quantization
levels with only 32 comparator preamplifiers. This keeps input
capacitance to a minimum. The midpoint of the reference lad-
der is fed back to the analog input, allowing easy biasing of the
ADC to midscale for ac coupled applications.
As shown in Figure 4d, a simple resistor is used to provide the
reference ladder midpoint to the analog input. The high imped-
ance MOS inputs of the comparators insure no static voltage
drop across the resistor. This eliminates the need for an active
buffer (and its inherent offsets) to set the reference midpoint at
the analog input.
The outputs of the comparators are converted to a 6-bit word
and converted to CMOS levels. The digital signals are latched at
six stages (two pipeline delays) in the signal path. The digital
outputs are CMOS with approximately equal rise and fall times.
The encode clock utilizes a CMOS input stage with TTL-
compatible (1.4 V) thresholds. Internal clock buffers minimize
external clock drive requirements.
REV. A
AD9066
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