ADC08D1520QML-SP Datasheet, PDF (5/59 Pages) Texas Instruments – ADC08D1520QML Low Power, 8-Bit, Dual 1.5 GSPS or Single 3.0 GSPS A/D Converter

ADC08D1520QML-SP
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Pin Functions
Pin No.
Symbol
SNAS420O – JANUARY 2008 – REVISED MARCH 2013
Pin Descriptions and Equivalent Circuits (continued)
Equivalent Circuit
Description
127
DES / SCS
V_A
50k
50k
GND
Dual Edge Sampling and Serial Interface Chip Select. With
pin 41 logic low, the device is in Extended Control Mode and
this pin is the enable pin for the Serial Interface . When in
Non-Extended Control Mode and this pin is connected to
V_A/2, DES Mode is selected where the I- Channel input is
sampled at twice the input clock rate and the Q- Channel
input is ignored. See Dual-Edge Sampling. When in Non-
Extended Controll Mode and DES is not desired, this pin
should be tied to V_A.
V_A
18
CLK+
19
CLK-
AGND
V_A
50k
100
50k
V_BIAS
LVDS Clock input pins for the ADC. The differential clock
signal must be a.c. coupled to these pins. The input signal is
sampled on the falling edge of CLK+. See Acquiring the Input
for a description of acquiring the input and THE CLOCK
INPUTS for an overview of the clock inputs.
10
V_INI−
11
V_INI+
22
V_INQ+
23
V_INQ−
AGND
V_A
50k
AGND
100
V_A
50k
V_CMO
Control from V_CMO
Analog signal inputs to the ADC. The differential full-scale
input range is programmable using the FSR pin 14 in Non-
Extended Control Mode and the Input Full-Scale Voltage
Adjust register in the Extended Control Mode. Refer to the V_IN
specification in the Converter Electrical Characteristics for the
full-scale input range in the Non-Extended Control Mode.
Refer to REGISTER DESCRIPTION for the full-scale input
range in the Extended Control Mode.
AGND
7
V_CMO
V_A
200k
8 pF
V_CMO
Enable AC
Coupling
Common Mode Voltage. This pin is the common mode output
in d.c. coupling mode and also serves as the a.c. coupling
mode select pin. When d.c. coupling is used at the analog
inputs, the voltage output at this pin is required to be the
common mode input voltage at VIN+ and VIN−. When a.c.
coupling is used, this pin should be grounded. This pin is
capable of sourcing or sinking 100 μA. See THE ANALOG
INPUT.
GND
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