adc1020 austriamicrosystems, adc1020 Datasheet - Page 6

• Manufacturer Part Number: adc1020
• Description: Cmos 10-bit Pipelined A/d Converter
• Manufacturer: austriamicrosystems

Datasheet : ADC1020 – C35
SYMBOL
THEORY OF OPERATION
The AD1020 is a 10-bit ADC capable of sampling at 20 MS/s. It
uses a fully differential pipelined architecture with 1.5-bit per stage
and digital error correction to achieve improved linearity
performance. A dedicated wide-band input sample-and-hold
amplifier (S/H) is built-in to provide low-jitter, sub-sampling
capability with inherent frequency down-conversion and, optionally,
Revision C, 07.09.02
PINLIST
Pin
VINP
VINN
VBG
VREFP
VREFN
VCMU
VCM
CLK
B[9:0]
ONADC
ONREF
ONCM
DGT
DOUT
SWIB
IBIAS
VDDA1
VDDA2
VDDD1
VSSA1
VSSA2
VSSD1
VSSD2
Description
Pos. Input Voltage
Neg. Input Voltage
Input for Bandgap Reference Voltage
Output or bypass of Internal Pos. Reference
Voltage
Output or bypass of Internal Neg. Reference
Voltage
Input for Unbuffered Common Mode Voltage
for Analog Signals
Output or bypass of internally buffered VCM
Clock Input
Digital Output Bits (B9 = MSB,
B0 = LSB)
Power Down Input for ADC (ONADC = 1 ⇔
normal operation)
Power Down Input for Reference Generator
(ONREF=1⇔ normal operation)
Power Down Input for VCM buffer
(ONCM=1⇔ normal operation)
Input for digital test mode;
must be tied to VSSD1
Input for ADC flash output data test mode;
must be tied to VDDD1
Bias current control pin; if High, the ADC
uses internal bias current; otherwise it
enables the external current input.
Output for monitoring internal bias current
generation when SWIB="1" or input for
injection of external bias current (10µA)
when SWIB="0"
Top Analog Power Supply
Top Analog Power Supply
Top Digital Power Supply
Bottom Analog Power Supply
Biasing voltage for an N-Well shielding a bus
from the substrate
Bottom Digital Power Supply
Bottom Digital Power Supply for Shielding
single-ended to fully differential signal conversion. The raw digital
words are synchronized by a chain of delay stages and overlapped
and processed by the digital error correction logic to produce the
10-bit digital output code.
I/O
I
I
I
I/O
I/O
I
I/O
I
O
I
I
I
I
I
I
I/O
I
I
I
I
I
I
I
Page 6 of 11
Type
Analog
Analog
Analog
Analog
Analog
Analog
Analog
Digital
Digital
Digital
Digital
Digital
Digital
Digital
Digital
Analog
Supply
Supply
Supply
Supply
Supply
Supply
Supply