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ADC08B3000 Datasheet(PDF) 4 Page - National Semiconductor

Part No. ADC08B3000
Description  High Performance, Low Power, 8-Bit, 3 GSPS A/D Converter with 4K Buffer
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Maker  NSC [National Semiconductor]
Homepage  http://www.national.com
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 4 page
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Pin Descriptions and Equivalent Circuits (Continued)
Pin Functions
Pin No.
Symbol
Equivalent Circuit
Description
18
19
V
IN+
V
IN
Analog signal inputs to the ADC. The differential full-scale
input range is 600 mV
P-P when the FSR pin is low, or 800
mV
P-P when the FSR pin is high.
7V
CMO
Common Mode Voltage. The voltage output at this pin is
required to be the common mode input voltage at V
IN+ and
V
IN− when d.c. coupling is used. This pin should be grounded
when a.c. coupling is used at the analog input. This pin is
capable of sourcing or sinking 100µA. See Section 2.2.
31
V
BG
Bandgap output voltage capable of 100 µA source/sink.
126
CalRun
Calibration Running indication. This pin is at a logic high
when calibration is running.
32
R
EXT
External bias resistor connection. Nominal value is 3.3k-Ohms
(±0.1%) to ground. See Section 1.1.1.
34
35
Tdiode_P
Tdiode_N
Temperature Diode Positive (Anode) and Negative (Cathode)
for die temperature measurements. See Section 2.6.2.
45
REN
Read Enable. A logic high on this input causes a byte of data
to be read from the Capture Buffer with each RCLK cycle.
This signal must not be asserted while the WEN is already
asserted. This signal may be asserted asynchronously as it is
internally synchronized with the internal sampling clock.
46
WEN
Write Enable. A logic high on this input causes a byte of data
to be written into the Capture Buffer with each sampling clock
cycle.This signal may be asserted asynchronously as it is
internally synchronized with the internal sampling clock.
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