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参数资料
| 型号： | AD9058JD |
| 厂商： | ANALOG DEVICES INC |
| 元件分类： | ADC |
| 英文描述： | Dual 8-Bit 50 MSPS A/D Converter |
| 中文描述： | DUAL 1-CH 8-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, CDIP48 |
| 封装： | HERMETIC SEALED, CERAMIC, DIP-48 |
| 文件页数： | 5/8页 |
| 文件大小： | 148K |
| 代理商： | AD9058JD |
REV. B
AD9058
–5–
THEORY OF OPERATION
The AD9058 contains two separate 8-bit analog-to-digital con-
verters (ADCs) on a single silicon die. The two devices can be
operated independently with separate analog inputs, voltage
references and clocks.
In a traditional flash converter, 256 input comparators are required
to make the parallel conversion for 8-bit resolution. This is in
marked contrast to the scheme used in the AD9058, as shown
in Figure 1.
Unlike traditional “flash,” or parallel, converters, each of the two
ADCs in the AD9058 utilizes a patented interpolating archi-
tecture to reduce circuit complexity, die size and input capacitance.
These advantages accrue because, compared to a conventional
flash design, only half the normal number of input comparator
cells is required to accomplish the conversion.
In this unit, each of the two independent ADCs uses only 128
(2
7
) comparators to make the conversion. The conversion for
the seven most significant bits (MSBs) is performed by the 128
comparators. The value of the least significant bit (LSB) is
determined by interpolation between adjacent comparators in
the decoding register. A proprietary decoding scheme processes
the comparator outputs and provides an 8-bit code to the output
register of each ADC; the scheme also minimizes error codes.
Analog input range is established by the voltages applied at the
voltage reference inputs (+V
REF
and –V
REF
). The AD9058 can
operate from 0 V to +2 V using the internal voltage reference,
or anywhere between –1 V and +2 V using external references.
Input range is limited to 2 V p-p when using external references.
The internal resistor ladder divides the applied voltage reference
into 128 steps, with each step representing two 8-bit quantiza-
tion levels.
2
1
I
D
L
256
8
8
128
127
ANALOG IN
–
V
REF
+V
REF
Figure 1. AD9058 Comparator Block Diagram
The onboard voltage reference, +V
INT
, is a bandgap reference
which has sufficient drive capability for both reference ladders.
It provides a +2 V reference that can drive both ADCs in the
AD9058 for unipolar positive operation (0 V to +2 V).
USING THE AD9058
Refer to Figure 2. Using the internal voltage reference con-
nected to both ADCs as shown reduces the number of external
components required to create a complete data acquisition sys-
tem. The input ranges of the ADCs are positive unipolar in this
configuration, ranging from 0 V to +2 V. Bipolar input signals
are buffered, amplified and offset into the proper input range of
the ADC using a good low distortion amplifier such as the
AD9617 or AD9618.
18
17
16
15
14
13
12
11
28
29
30
31
32
33
34
35
ENCODE
A
ENCODE
B
3
43
8
38
10pF
1k
74HCT04
50
5, 9, 22,
24, 37, 41
+5V
D
0B
(LSB)
D
7B
(MSB)
8
8
7
CLOCK
CLOCK
–
V
S
7, 20,
26, 39
0.1μF
1N4001
4,19, 21
25, 27, 42
ENCODE
10
36
AD9058
(J-LEAD)
7
ANALOG
IN B
±0.5 V
AD9617
400
200
5
ANALOG
IN A
±0.5 V
0.1μF
AD9617
400
200
5
20k
20k
800
AD707
800
6
2
+V
INT
COMP
1
0.1μF
0.1μF
+2V
40
2V
–
+
–
+
–
+
–
5V
–
(SEE TEXT)
+V
S
D
0A
(LSB)
D
7A
(MSB)
+V
REF A
+V
REF B
A
IN A
–
V
REF A
–
V
REF B
A
IN B
Figure 2. AD9058 Using Internal +2 V Voltage Reference
相关PDF资料 |
PDF描述 |
|---|---|
| AD9058JJ | Dual 8-Bit 50 MSPS A/D Converter |
| AD9058KJ | Dual 8-Bit 50 MSPS A/D Converter |
| AD9058 | Dual 8-Bit 50 MSPS A/D Converter |
| AD9058KD | Dual 8-Bit 50 MSPS A/D Converter |
| AD9059PCB | Dual 8-Bit, 60 MSPS A/D Converter |
相关代理商/技术参数 |
参数描述 |
|---|---|
| AD9058JJ | 制造商:Rochester Electronics LLC 功能描述:8-BIT 40MHZ ADC IC IC - Bulk |
| AD9058KD | 制造商:AD 制造商全称:Analog Devices 功能描述:Dual 8-Bit 50 MSPS A/D Converter |
| AD9058KJ | 制造商:AD 制造商全称:Analog Devices 功能描述:Dual 8-Bit 50 MSPS A/D Converter |
| AD9058TD/883 | 制造商:AD 制造商全称:Analog Devices 功能描述:Dual 8-Bit 50 MSPS A/D Converter |
| AD9058TJ/833 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Analog to Digital Converter |
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