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參數(shù)資料
| 型號(hào)： | ADC12762 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | 12-Bit, 1.4 MHz, 300 mW A/D Converter with Input Multiplexer and Sample/Hold |
| 中文描述： | 12位，1.4兆赫，300毫瓦的A / D輸入多路復(fù)用器和轉(zhuǎn)換器采樣/保持 |
| 文件頁數(shù)： | 10/20頁 |
| 文件大?。?/td> | 427K |
| 代理商： | ADC12762 |
Pin Descriptions
(Continued)
OE
This is the active high Output Enable
control input. This pin can be thought of
as an inverted version of the RD input
(see
Figure
6).
DB0–DB11 are TRI-STATE when OE is
low. Data appears on DB0–DB11 only
when OE is high and CS and RD are
both low. This pin can be tied high.
This is the Sample/Hold control input.
The analog input signal is held and a
new conversion is initiated by the falling
edge of this control input (when CS is
low).
This is the Power Down control input.
This pin should be held high for normal
operation. When this pin is pulled low,
the device goes into a low power standby
mode.
These are the positive and negative volt-
age reference force inputs, respectively.
See Section 4, REFERENCE INPUTS,
for more information.
Data
output
pins
S/H
PD
V
REF+(FORCE)
,
V
REF(FORCE)
V
REF+(SENSE)
,
V
REF(SENSE)
These are the positive and negative volt-
age reference sense pins, respectively.
See Section 4, REFERENCE INPUTS,
for more information.
This pin should be bypassed to AGND
with a 0.1 μF ceramic capacitor.
This pin should be tied to DV
CC
.
V
REF
/16
TEST
Functional Description
The ADC12762 performs a 12-bit analog-to-digital conver-
sion using a 3 step flash technique. The first flash deter-
mines the six most significant bits, the second flash gener-
ates four more bits, and the final flash resolves the two least
significant bits. Figure 4shows the major functional blocks of
the converter. It consists of a 2
1
2
-bit Voltage Estimator, a re-
sistor ladder with two different resolution voltage spans, a
sample/hoId capacitor, a 4-bit flash converter with front end
multiplexer, a digitally corrected DAC, and a capacitive volt-
age divider. To pipeline the converter, there are two sample/
hold capacitors and 4-bit flash sections, which allows the
converter to acquire the next input sample while converting
the previous one. Only one of the flash converter pairs is
shown in Figure 4 to reduce complexity.
DS012811-27
FIGURE 4. Functional Block Diagram
www.national.com
10
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