ADC08D1000DEV NSC [National Semiconductor], ADC08D1000DEV Datasheet - Page 4

• Manufacturer Part Number: ADC08D1000DEV
• Description: High Performance, Low Power, Dual 8-Bit, 1 GSPS A/D Converter
• Manufacturer: NSC [National Semiconductor]

www.national.com
Pin Functions
Pin No.
127
126
18
19
11
10
22
23
31
7
CalDly / DES /
Symbol
CalRun
V
V
CLK+
V
CLK-
V
V
SCS
V
IN
IN
CMO
IN
IN
BG
Q+
Q−
I+
I−
Equivalent Circuit
4
Calibration Delay, Dual Edge Sampling and Serial Interface Chip
Select. With a logic high or low on pin 14, this pin functions as
Calibration Delay and sets the number of input clock cycles after
power up before calibration begins (See 1.1.1 Self-Calibration).
With pin 14 floating, this pin acts as the enable pin for the serial
interface input and the CalDly value becomes "0" (short delay with
no provision for a long power-up calibration delay). When this pin
is floating or connected to a voltage equal to V
Sampling) mode is selected where the "I" input is sampled at twice
the input clock rate and the "Q" input is ignored. See 1.1.5.1 Dual-
Edge Sampling.
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 1.1.2 Acquiring the Input for a
description of acquiring the input and Section 2.3 for an overview
of the clock inputs.
Analog signal inputs to the ADC. The differential full-scale input
range of this input is programmable using the FSR pin 14 in normal
mode and the Input Full-Scale Voltage Adjust register in the
extended control mode. Refer to the V
Converter Electrical Characteristics for the full-scale input range
in the normal mode. Refer to 1.4 REGISTER DESCRIPTION for
the full-scale input range in the extended control mode.
Common Mode Voltage. The voltage output at this pin is required
to be the common mode input voltage at V
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 2.2 THE ANALOG INPUT.
Bandgap output voltage capable of 100 μA source/sink.
Calibration Running indication. This pin is at a logic high when
calibration is running.
Description
IN
specification in the
IN
+ and V
A
/2, DES (Dual Edge
IN
− when d.c.