ADC12181 National Semiconductor, ADC12181 Datasheet - Page 4

• Manufacturer Part Number: ADC12181
• Description: 12-Bit/ 10 MHz Self-Calibrating/ Pipelined A/D Converter with Internal Sample & Hold
• Manufacturer: National Semiconductor

www.national.com
Pin Descriptions and Equivalent Circuits #2
14-19,
22-27
9, 12
4, 6
No.
13
21
20
3
5
DGND I/O
D0 - D11
Symbol
V
AGND
DGND
V
IN com
D
V
V
D
A
I/O
Equivalent Circuit
4
Digital output word, CMOS compatible. D0 (pin 14) is
LSB, D11 (pin 27) is MSB. Load with no more than
50pF.
Analog input common. Connect to a quiet point in
analog ground near the driving device. See section
1.2.
Positive analog supply pin. Connect to a clean, quiet
voltage source of +5V. V
common supply and be separately bypassed with a
5µF to 10µF capacitor and a 0.1µF chip capacitor.
The ground return for the analog supply. AGND and
DGND should be connected together close to the
ADC12181 package. See section 5.0.
Positive analog supply pin. Connect to a clean, quiet
voltage source of +5V. V
common supply and be separately bypassed with a
5µF to 10µF capacitor and a 0.1 µF chip capacitor.
The ground return for the analog supply. AGND and
DGND should be connected together close to the
ADC12181 package. See section 5.0
The digital output driver supply pin. This pin can be
operated from a supply voltage of 3V to 5V, but the
voltage on this pin should never exceed the V
supply pin voltage.
The ground return for the output drivers. This pin
should be returned to a point in the digital ground
that is removed from the other ground pins of the
ADC12181.
(Continued)
Description
A
A
and V
and V
D
D
should have a
should have a
D