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參數資料
| 型號： | AD9432BSQ-105 |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | ADC |
| 英文描述： | 12-Bit, 80 MSPS/105 MSPS A/D Converter |
| 中文描述： | 1-CH 12-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PQFP52 |
| 封裝： | HEAT SINK, POWER, PLASTIC, LQFP-52 |
| 文件頁數： | 10/16頁 |
| 文件大小： | 431K |
| 代理商： | AD9432BSQ-105 |
REV. B
AD9432
–10–
The minimum guaranteed conversion rate of the AD9432 is
1 MSPS. At internal clock rates below 1 MSPS, dynamic
performance may degrade. Therefore, input clock rates below
1 MHz should be avoided.
Table I. Output Coding (VREF = +2.5 V) (Two’s Complement)
Code
AIN–
AIN
(V)
Digital Output
+2047
0
–1
–2048
1.000
0
–0.00049
–1.000
0111 1111 1111
0000 0000 0000
1111 1111 1111
1000 0000 0000
Using the AD8138 to Drive the AD9432
A new differential output op amp from Analog Devices, Inc.,
the AD8138 can be used to drive the AD9432 in dc-coupled
applications. The AD8138 was specifically designed for ADC
driver applications. Superior SNR performance is maintained up
to analog frequencies of 30 MHz. The AD8138 op amp provides
single-ended-to-differential conversion, providing for a low cost
option to transformer coupling for ac applications as well.
The circuit in Figure 26 was breadboarded and the measured
performance is shown in Figures 27 and 28. The figures shown
are for
±
5 V supplies at the AD8138—performance dropped by
about 1 dB–2 dB with a single +5 V supply at the AD8138.
Figure 27 shows SNR and SINAD for a –1 dBFS analog input
frequency varied from 2 MHz to 40 MHz with an encode rate of
105 MSPS. The measurements are for nominal conditions at
room temperature. Figure 28 shows the second and third har-
monic distortion performance under the same conditions.
The dc common-mode voltage for the AD8138 outputs can be
adjusted via input V
OCM
to provide the 3 V common-mode voltage
the AD9432 inputs require.
AD8138
500
500
50
50
22pF
AIN
AIN
AD9432
10pF
10pF
500
25
50
500
V
OCM
3k
2k
5V
VIN
0.1 F
Figure 26. AD8138/AD9432 Schematic
AIN MHz
0
d
20
60
64
40
63
62
61
60
SNR
SINAD
65
66
Figure 27. Measured SNR and SINAD (Encode = 105 MSPS)
AIN MHz
d
–
80
–
90
–
100
–
70
H2
H3
0
20
40
60
Figure 28. Measured Second and Third Order Harmonic
Distortion (Encode = 105 MSPS)
EVALUATION BOARD
The AD9432 evaluation board offers an easy way to test the
AD9432. It requires an analog signal, encode clock, and power
supplies as inputs. The clock is buffered on the board to provide
the clocks for an on-board DAC and latches. The digital outputs
and output clock are available at a standard 37-pin connector P7.
Power Connector
Power is supplied to the board via two detachable 4-pin power
strips P30, P40.
P40
P1
P2
P3
P4
VCC2 5 V/165 mA
GND
VCC
5 V/200 mA
GND
DAC Supply
ADC Analog Supply
P30
P5
P6
P7
P8
No Connect
No Connect
VD
GND
3.3 V /105 mA Latch, ADC Digital Output Supply
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相關代理商/技術參數 |
參數描述 |
|---|---|
| AD9432BSQ-80 | 制造商:Analog Devices 功能描述:ADC Single Pipelined 80Msps 12-bit Parallel 52-Pin LQFP 制造商:Rochester Electronics LLC 功能描述:12 BIT 80MSPS ADC - Bulk |
| AD9432BSQZ-80 | 制造商:AD 制造商全稱:Analog Devices 功能描述:12-Bit, 80 MSPS/105 MSPS ADC |
| AD9432BST105 | 制造商:Analog Devices 功能描述: |
| AD9432BST-105 | 制造商:Analog Devices 功能描述:ADC Single Pipelined 105Msps 12-bit Parallel 52-Pin LQFP 制造商:Analog Devices 功能描述:Analog-Digital Converter IC Number of Bi |
| AD9432BST-80 | 制造商:Analog Devices 功能描述:ADC Single Pipelined 80Msps 12-bit Parallel 52-Pin LQFP 制造商:Analog Devices 功能描述:SEMICONDUCTOR ((NW)) |
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