0.13

µ
µ

m 8-CHANNEL 10-BIT 500KSPS ADC

ADC1395X_PC

GENERAL DESCRIPTION

The adc1395x_pc is a CMOS 3.3V 10-bit analog-to-digital converter (ADC). It converts the analog input signal
into 10-bit binary digital codes at a maximum conversion rate of 500KSPS with 2.5MHz clock.

The device is a recycling type monolithic ADC with an on-chip sample-and-hold function. The ADC has power
down mode.

FEATURES

-- Resolution: 10-bit

-- Maximum conversion rate: 500KSPS

-- Main clock: 2.5MHz (max.)

-- Power supply: 3.3V

0.3V

-- Total current: 20uA (Standby mode)

2.5mA (Normal operation)

-- Input range: 0.0V ~ 3.3V (3.3V

P-P

)

-- Differential linearity error:

1.0 LSB

-- Integral linearity error:

2.0 LSB

-- Signal to noise & distortion ratio: 54dB (Typ.)

-- Digital output: CMOS Level

-- Operating temperature range: 40

C ~ 85

TYPICAL APPLICATIONS

-- MICOM interface

-- Portable equipment

-- Low-power application

ADC1395X_PC

0.13

µ
µ

m 8-CHANNEL 10-BIT 500KSPS ADC

FUNCTIONAL BLOCK DIAGRAM

CLOCK

GEN

AIN[7:0]

VREF

AGND

DO[9:0]

STC

CKIN

STBY

CML
GEN

REF

GEN

MAIN

BIAS

FLASH2

FLASH1

Digital Logic

EOC

MDAC1

MDAC2

ANALOG

MUX

SEL[2:0]

Level
Shift

3.3V

1.2V

Ver 1.0 (Aug. 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.

0.13

µ
µ

m 8-CHANNEL 10-BIT 500KSPS ADC

ADC1395X_PC

CORE PIN DESCRIPTION

Name

I/O Type

I/O Pad

Pin Description

VREF

phia_abb

Reference top (3.3V)

AGND

phia_abb

Reference bottom (0.0V)

AVDD33A1

vdd3t_abb

Analog power (3.3V)

AVBB33A1

vbb3_abb

Analog sub bias (0.0V)

AVSS33A1

vss3t_abb

Analog ground (0.0V)

AIN[7:0]

phiar50_abb

Analog input (input range: 0.0V ~ 3.3V)

SEL[2:0]

picc_abb

Analog input selection pin

STBY

picc_abb

VDD = Power saving (standby),
GND = Normal

CKIN

picc_abb

Sampling clock input

D[9:0]

pot6_abb

Digital output

EOC

pot6_abb

End of conversion signal

STC

picc_abb

Start of conversion signal

AVSS33A2

vss3t_abb

Digital GND (0.0V)

AVDD33A2

vdd3t_abb

Digital power (3.3V)

AVDD12

vdd1t_abb

Digital power (1.2V)

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

0.13

µ
µ

m 8-CHANNEL 10-BIT 500KSPS ADC

ADC1395X_PC

ABSOLUTE MAXIMUM RATINGS

Characteristics

Symbol

Value

Unit

Supply voltage

VDD33

3.8

Analog input voltage

AINT

VSS to VDD

Digital input voltage

CKIN

VSS to VDD

Reference voltage

VREF / AGND

VSS to VDD

Storage temperature range

Tstg

45 to 150

Operating temperature range

Topr

40 to 85

NOTES:
1.

Absolute

maximum

rating

specifies

the

values

beyond

which

the

device

may

damaged

permanently.

Exposure

absolute

maximum

rating

conditions

for

extended

periods

may

affect

reliability.

Each

condition

value

applied

with

the

other

values

kept

within

the

following

operating

conditions

and

function

operation

under

any

these

conditions

not

implied.

All

voltages

are

measured

with

respect

VSS

unless

otherwise

specified.

100pF

capacitor

discharged

through

1.5k

resistor

(Human

body

model)

RECOMMENDED OPERATING

CONDITIONS

Characteristics

Symbol

Min

Typ

Max

Unit

Supply voltage

AVDD33A1
AVDD33A2

3.0

3.3

3.6

Reference input voltage

VREF

AGND

2.0
0.0

3.3
0.0

3.6
0.0

Analog input voltage

AINT

0.0

VREF

Operating temperature

Toper

NOTE: It is strongly recommended that all the supply pins (AVDD33A1, AVDD33A2) be powered from the same source to

avoid power latch-up.

DC ELECTRICAL

CHARACTERISTICS

Characteristics

Symbol

Min

Typ

Max

Unit

Test Condition

Differential nonlinearity

DNL

0.8

LSB

VREF = 3.3V
AGND = 0.0V

Integral nonlinearity

INL

1.0

LSB

VREF = 3.3V
AGND = 0.0V

Offset voltage

TOPOFF
BOTOFF

LSB

VREF = 3.3V
AGND = 0.0V

(Converter

Specifications:

AVDD33A1=AVDD33A2=3.3V,

AVDD12=1.2V, AVSS33A1=AVSS33A2=0V,

Toper=25

VREF=3.3V,

AGND=0.0V

unless

otherwise

specified)

ADC1395X_PC

0.13

µ
µ

m 8-CHANNEL 10-BIT 500KSPS ADC

AC ELECTRICAL

CHARACTERISTICS

Characteristics

Symbol

Min

Typ

Max

Unit

Test Condition

Maximum conversion rate

500

KSPS

CKIN

= 2.5MHz

Standby supply current

STBY = VDD

Dynamic supply current

IVDD

2.5

CKIN

= 2.5MHz

(without system load)

Reference current

IREF

0.4

0.6

REF

= 3.3V

Total harmonic distortion

THD

CKIN

= 2.5MHz

AINT = 100kHz

Signal-to-noise & distortion
ratio

SNDR

CKIN

= 2.5MHz

AINT = 100kHz

(Converter

Specifications

AVDD33A1=AVDD33A2=3.3V, AVDD12=1.2V,

AVSS33A1=AVSS33A2=0V, Toper=25

VREF=3.3V,

AGND=0.0V

unless

otherwise

specified)

I/O

CHART

Index

AINT Input (V)

Digital Output

~ 0.00322

00 0000 0000

1LSB = 3.22mV

0.00322 ~ 0.00644

00 0000 0001

VREF = 3.3V

0.00644 ~ 0.00967

00 0000 0010

AGND = 0.0V

511

1.64678 ~ 1.65000

01 1111 1111

512

1.65000 ~ 1.65322

10 0000 0000

513

1.65322 ~ 1.65644

10 0000 0001

1021

3.29033 ~ 3.29355

11 1111 1101

1022

3.29355 ~ 3.29678

11 1111 1110

1023

3.29678 ~

11 1111 1111

0.13

µ
µ

m 8-CHANNEL 10-BIT 500KSPS ADC

ADC1395X_PC

TIMING DIAGRAM

1. Main Waveform

STBY

STC

DO[9:0]

CKIN

Input Sampling Period

AIN[7:0]

EOC

SEL[2:0]

2. STC & CKIN Condition

10ns

CKIN

STC

3ns

SAFE

The A/D Converter operates data conversion when STC (Start Conversion) signal is just "HIGH". Otherwise,
output data (DO[9:0]) keep the current states. The STC signal should be changed during "T

SAFE

" with the "HIGH"

level of the clock to operation as shown in the main waveform.

ADC1395X_PC

0.13

µ
µ

m 8-CHANNEL 10-BIT 500KSPS ADC

3. SEL[2:0] & CKIN Condition

10ns

CKIN

SEL[2:0]

10ns

The transition of SEL[2:0] signals should be synchronized with the falling edge of CKIN signal.

This ADC samples analog input signal at the first low state of CKIN after rising transition of STC.

So you should keep in mind that a proper channel should be selected by SEL[2:0] before sampling the analog
input signal.

0.13

µ
µ

m 8-CHANNEL 10-BIT 500KSPS ADC

ADC1395X_PC

CORE EVALUATION GUIDE

ADC function is evaluated by external check on the bi-directional pads connected to input nodes of HOST DSP
back-end circuit.

The reference voltages may be biased internally through resistor divider.

STBY

CKIN

AIN[7:0]

VREF

AGND

AVDD33A1

AVSS33A1

AVBB33A1

AVSS33A2

AVDD12

[MSB:LSB]

STC

DO[9:0]

EOC

Digital

Mux

HOST

DSP

CORE

Bi-directional

PAD

D[9:0]

(ADC Function Test & Externally

Forced Digital Input)

SEL[2:0]

AVDD33A2

adc1395x_pc

ADC1395X_PC

0.13

µ
µ

m 8-CHANNEL 10-BIT 500KSPS ADC

USER GUIDE

Input Range

The analog input is single-ended type and the range is from VREF to AGND. This AINT voltage follows reference
voltage range fundamentally. So, if you want to alter into the another input range, you should change the voltage
value of VREF.

You can use the AINT voltage whose minimum range is 2.0V. In this case, the VREF is 2.0V.

ANALOG INPUT SELECTION TABLE

AIN[7]

AIN[6]

AIN[5]

AIN[4]

AIN[3]

AIN[2]

AIN[1]

AIN[0]

SEL[2]

SEL[1]

SEL[0]

ADC1395X_PC

0.13

µ
µ

m 8-CHANNEL 10-BIT 500KSPS ADC

Name

I/O Type

Pin Usage

Pin Description

AIN[7:0]

Internal / External

AIN[7:0] signal should not be crossed by any signals
and should not run next to digital signals to minimize
capacitive coupling between the two signals.

SEL[2:0]

Internal / External

Digital Input Signal lines must have same length to
reduce
propagation delay.

STBY

Internal / External

CKIN

Internal / External

D[9:0]

Internal / External

EOC

Internal / External

STC

Internal / External

VREF

External

Voltage reference lines (VREF and AGND) must be wide
metal to reduce voltage drop of metal lines.

AGND

External

AVDD33A1

External

It is recommended that you use thick analog power
metal. When connected to PAD, the path should be kept
as short as possible.

AVBB33A1

External

Digital power and analog power are separately used.

AVSS33A1

External

AVSS33A2

External

AVDD33A2

External

AVDD12

External

Internal

EN, ENB are special function pin.

ENB

Internal

Actually, EN = VDD (1.2V or 3.3V), ENB = VSS

0.13

µ
µ

m 8-CHANNEL 10-BIT 500KSPS ADC

ADC1395X_PC

FEEDBACK

REQUEST

It should be quite helpful to our ADC core development if you specify your system requirements on ADC in the
following characteristic checking table and fill out the additional questions.

We appreciate your interest in 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

Pipeline delay

CLK

Digital output format
(Provide detailed description &
timing diagram)

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

2. 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.

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

Ð­Ð»ÐµÐºÑ‚Ñ€Ð¾Ð½Ð½Ñ‹Ð¹ ÐºÐ¾Ð¼Ð¿Ð¾Ð½ÐµÐ½Ñ‚: adc1395x_pc

ÐÐ»ÐµÐºÑ‚Ñ€Ð¾Ð½Ð½Ñ‹Ð¹ ÐºÐ¾Ð¼Ð¿Ð¾Ð½ÐµÐ½Ñ‚: adc1395x_pc