ADC081500 Datasheet, PDF (4/28 Pages) National Semiconductor (TI) – High Performance, Low Power, 8-Bit, 1.5 GSPS A/D Converter

Pin Descriptions and Equivalent Circuits (Continued)
Pin Functions
Pin No.
Symbol
Equivalent Circuit
Description
11
V_IN+
10
V_IN−
7
V_CMO
31
V_BG
126
CalRun
32
R_EXT
Analog signal inputs to the ADC. The differential full-scale
input range is 650 mV_P-P when the FSR pin is low, or 870
mV_P-P when the FSR pin is high.
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 inputs. This pin is
capable of sourcing or sinking 100µA. See Section 2.2.
Bandgap output voltage capable of 100 µA source/sink.
Calibration Running indication. This pin is at a logic high when
calibration is running.
External bias resistor connection. Nominal value is 3.3k-Ohms
(±0.1%) to ground. See Section 1.1.1.
34
Tdiode_P
35
Tdiode_N
83
D7−
84
D7+
85
D6−
86
D6+
89
D5−
90
D5+
91
D4−
92
D4+
93
D3−
94
D3+
95
D2−
96
D2+
100
D1−
101
D1+
102
D0−
103
D0+
Temperature Diode Positive (Anode) and Negative (Cathode)
for die temperature measurements. See Section 2.6.2.
The LVDS Data Outputs that are not delayed in the output
demultiplexer. Compared with the Dd outputs, these outputs
represent the later time samples. These outputs should
always be terminated with a 100Ω differential resistor.
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