ADC1394X

0.13

µ
µ

m 8-BIT 20MSPS ADC

GENERAL DESCRIPTION

The adc1394x is a CMOS 8-bit low_power and high-speed A/D converter (ADC) for WLAN(Wireless LAN) and
other applications. This ADC has three-step pipelined architecture, which consists of sample & hold amplifier,
multiplying D/A converters (DACs), and subranging flash ADCs., and plus a reference generator.

The maximum conversion rate of ADC1394X is 20MSPS and supply voltage is 2.5V single.

FEATURES

-- Process:

CMOS

-- Resolution:

8-bit

-- Maximum

conversion

rate:

20MSPS

-- Power

supply:

2.5V

-- Power

consumption:

45mW

-- Differential

linearity

error:

1.0

LSB

(Typ)

-- Integral

linearity

error:

1.0

LSB

(Typ)

-- Internal sample-and-hold

-- Internal reference generation

-- Operational temperature range: 10

C ~ 70

TYPICAL APPLICATIONS

-- WLAN, CCD imaging processors

camcorders, scanners, and security cameras.

-- IF and baseband signal digitizers

-- Portable equipments for low-power applications

0.13

µ
µ

m 8-BIT 20MSPS ADC

ADC1394X

FUNCTIONAL BLOCK DIAGRAM

Reference

Generator

AI8

RP8

DO8[4]

DO8[7](MSB)

DO8[6]

DO8[5]

RM8

RS8

SAH

Digital Corection Logic

4-bit

Flash

DO8[3]

DO8[2]

DO8[1]

CK8

AVDD25D

AVBB25A

AVSS25A

AVDD25A

AVSS25D

AVBB25D

AVDD12D

DO8[0] (LSB)

PD8

REF8

MDAC1

MDAC2

RN8

SU8

Bias Current

Generator

Clock

Generator

3-bit

Flash

3-bit

Flash

4 bits

3 bits

Ver 1.3 (Jun. 2002)
This data sheet is a preliminary version. No responsibility is assumed by SEC for its use nor for any infringements of patents
or other rights of third parties that may result from its use. The content of this data sheet is subject to change without any
notice.

ADC1394X

0.13

µ
µ

m 8-BIT 20MSPS ADC

CORE PIN DESCRIPTION

Name

I/O Type

I/O Pad

Pin Description

AI8

pmiar50_abb

Positive analog input

CK8

pmicc_abb

Clock input (20MHz)

PD8

pmicc_abb

Power down (active high)

REF8

pmoar50_abb

External 1.2V source

RN8

pmoa_abb

Negative reference voltage (0.45V)

RP8

pmoa_abb

Positive reference voltage (1.35V)

RM8

pmoa_abb

Mid reference voltage (internally generated)

RS8

pmicc_abb

Internal/external reference selection
High: Internal reference
Low: External reference

SU8

pmicc_abb

ADC speed up

DO8[7:0]

pmob8_abb

Digital output

AVDD25A8

vdd25tm_abb

Analog power (+2.5V)

AVSS25A8

vsstm_abb

Analog ground (0.0V)

AVBB25A8

vbbm_abb

Analog substrate bias (0.0V)

AVDD25D8

vdd25tm_abb

Digital power (+2.5V)

AVSS25D8

vsstm_abb

Digital ground (0.0V)

AVBB25D8

vbbm_abb

Digital substrate bias (0.0V)

AVDD12D8

vdd12im_abb

Digital power for internal level shifter

I/O

Type

Abbr.

-- AI: Analog Input

-- DI: Digital Input

-- AO: Analog Output

-- DO: Analog Output

-- AP: Analog Power

-- AG: Analog Ground

-- DP: Digital Power

-- DG: Digital Ground

-- AB: Analog Bi-Direction

-- DB: Digital Bi-Direction

ADC1394X

0.13

µ
µ

m 8-BIT 20MSPS ADC

ABSOLUTE MAXIMUM RATINGS

Characteristic

Symbol

Value

Unit

Supply voltage

AVDD25A8
AVDD25D8

3.6

AVDD12D8

1.5

Analog input voltage

AI8

AVSS25A8 to AVDD25A8

Digital input voltage

CK8

AVSS25D8 to AVDD25D8

Digital output voltage

, V

AVSS25D8 to AVDD25D8

Storage temperature range

Tstg

45 to 150

NOTES:
1.

Absolute maximum rating specifies the values beyond which the device may be damaged permanently. Exposure
to absolute maximum rating conditions for extended periods may affect reliability. Each condition value is applied
with the other values kept within the following operating conditions and function operation under any of these conditions

not implied.

All

voltages

are

measured

with

respect

AVSS25A8/AVSS25D8

unless

otherwise

specified.

100pF

capacitor

discharged

through

1.5k

resistor

(Human

body

model)

RECOMMENDED OPERATING

CONDITIONS

Characteristics

Symbol

Min

Typ

Max

Unit

Supply voltage

AVDD25A8
AVDD25D8

2.3

2.5

2.7

AVDD12D8

1.1

1.2

1.3

Reference input voltage (externally)

RP8
RN8

1.35
0.45

Analog input voltage (+)

AI8

0.0

1.8

Analog input voltage (-)

RM8

0.9

Operating temperature

Topr

NOTES:
1.

strongly

recommended

that

all

the

supply

pins

(AVDD25A8,

AVDD25D8)

powered

from

the

same

source

avoid

power

latch-up.

Reference Input Voltage REF8, RP8 and RN8 are generated internally and can be forced externally.

In case that AVDD12D8 be connected to 1.2V power line of Digital Part during Full Chip Layout of Mixed Chip, a care
should be taken into the Test Vector Generation to insure at least one of the 1.2V Power Source of Digital Part, which
would be finally connected to ADC1394X through any indirect path, to be alive during the ADC Test Mode, because, in
general, 1.2V digital power could be down with Digital Part for Analog Core Test of Analog/Digital Mixed Chip.

0.13

µ
µ

m 8-BIT 20MSPS ADC

ADC1394X

DC ELECTRICAL

CHARACTERISTICS

Characteristics

Symbol

Min

Typ

Max

Unit

Conditions

Resolution

Bits

Differential linearity error

DLE

1.0

LSB

Integral linearity error

ILE

1.0

LSB

Bottom offset voltage error

EOB

LSB

Top offset voltage error

EOT

LSB

NOTE: Converter

specifications

(unless

otherwise

specified)

AVDD25A8=2.5V

AVDD25D8=2.5V

AVDD12D8=1.2V

AVSS25A8=GND

AVSS25D8=GND

AVBB25A8=GND

AVBB25D8=GND

RP8=1.35V

RN8=0.45V

PD8=Low

SU8=Low

RS8=Low

Ta=25

AC ELECTRICAL CHARACTERISTICS

Characteristics

Symbol

Min

Typ

Max

Unit

Conditions

Maximum conversion rate

MSPS

Dynamic supply current

Ivdd

fc = 20MHz
(without system load)

Power down current

Ipd

0.8

Ipd=I(AVDD25A8)+I(AVDD25D8)

Power-on settling time

Tset

0.3

See
"Delay Timing Diagram"

Digital output data delay

See
"Timing Diagram"

Signal - to - noise ratio

SNR

AI8 = 1MHz
fc = 20MHz

ADC1394X

0.13

µ
µ

m 8-BIT 20MSPS ADC

INPUT-OUTPUT MAPPING TABLE

Index

AI8 Input (V)

RM8 (V)

Digital Output

0.00000 ~ 0.00703

0.9

(Internally generated)

00000000

1LSB = 7.03125mV for
single input

0.00703 ~ 0.01406

00000001

RP8 = 1.35V

0.01406 ~ 0.02109

00000010

RN8 = 0.45V

127

0.89297 ~ 0.90000

01111111

128

0.90000 ~ 0.90703

10000000

129

0.90703 ~ 0.91406

10000001

253

1.77891 ~ 1.78594

11111101

254

1.78594 ~ 1.79297

11111110

255

1.79297 ~ 1.80000

11111111

ADC1394X

0.13

µ
µ

m 8-BIT 20MSPS ADC

DELAY TIMING DIAGRAM

CK8

DO8

PD8

RS8

RSS8

Cannot be Changed

Can be Changed

50us

Set-Up Time

. . .

(Stabilization Delay

0.3us Power-On Settling Time

DO8(0)

DO8(a)

INVALID

NOTES:
1.

Reference Control Input(RS8) should not be changed during ADC operation (while PD8 is LOW)

During ADC power down (while PD8 is HIGH), external source must be kept forced.

Reference Control Inputs can be set during PD8 LOW, with set-up timing constraint of at least 50us.

Although certain digital outputs would be presented on the DO8 right after PD8 goes LOW, those should be disregarded
for at 0.3us Stabilization Delay. That's because it takes time for the internal nodes of ADC to be stabilized after Power-

to operate correctly and produce the valid Digital Outputs.

0.13

µ
µ

m 8-BIT 20MSPS ADC

ADC1394X

CORE EVALUATION GUIDE

MUX

Host
DSP

Core

CK8

DO8[7:0]

RP8

adc1394x

AVDD25A8

RS8

AVDD25D8

AVSS25D8

AVBB25D8

AVDD12D8

RN8

REF8

AI8

RM8

SU8

PD8

AVSS25A8

AVBB25A8

+2.5V Analog

Power for

ADC

Analog GND

for ADC

Bi-Directional PAD

ADC Function

Measuring & Digital

Input Forcing

1.35V

0.45V

Low

0.0V ~ +1.8V

20MHz

1.2V

Low

Digital GND

for ADC

+2.5V Digital

Power for

Level Shifter

+2.5V Digital

Power for

ADC

NOTES:
: 10uF electronic capacitor unless otherwise specified
: 0.1uF ceramic capacitor unless otherwise specified

: Dedicated Pins
: Sharable Pins

ADC1394X

0.13

µ
µ

m 8-BIT 20MSPS ADC

USER GUIDE

1. Input Signal Range

The adc1394x is designed to use single mode input.

< Single Mode Input Condition >

Pins

Input Range

Conditions

AI8

0.0V ~ 1.8V

RM8

0.9V

Internally generated by the function of (RP8+RN8)/2

2. Input Signal Speed

Normal speed range of adc1394x is 1MHz ~ 6MHz input quantized by 20MHz clock, which is fixed by a normal
video signal format. To use the input of adc1394x on near nyquist ranges such as the direct IF processing,
consult about the additional performance issues with SEC.

0.13

µ
µ

m 8-BIT 20MSPS ADC

ADC1394X

FEEDBACK

REQUEST

It should

quite

helpful

our

ADC

core

development

you

specify

your

system

requirements

ADC

the

following

characteristic

checking

table

and

fill

out

the

additional

questions.

appreciate

your

interest

our

products.

Thank

you

very

much.

Characteristic

Min

Typ

Max

Unit

Remarks

Analog power supply voltage

Digital power supply voltage

Bit resolution

Bit

Reference input voltage

Analog input voltage

Vpp

Operating temperature

Integral non-linearity error

LSB

Differential non-linearity error

LSB

Bottom offset voltage error

Top offset voltage error

Maximum conversion rate

MSPS

Dynamic supply current

Power dissipation

Signal-to-noise ratio + distortion ratio

Pipeline delay

CLK

Digital output format (provide detailed
description & timing diagram)

-- Between single input-output and differential input-output configurations, which one is suitable for your system

and why?

-- Please comment on the internal/external pin configurations you want our ADC to have, if you have any

reason to prefer some type of configuration.

-- Freely list those functions you want to be implemented in our ADC, if you have any.

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