AL1213A.PDF

AL1213A

8-BIT 0.5MSPS DAC

GENERAL DESCRIPTION

The AL1213A is a CMOS 8-bit D/A converter for general application. This digital to analog converter consists of a
R-2R ladder block & an Op amp block. Its maximum conversion rate is 0.5MSPS.

FEATURES

Resolution : 8-bit

Differential Linearity Error :

0.4 LSB (TYP)

Maximum Conversion Rate : 0.5MSPS

Supply Voltage : 5V

External Voltage Reference

Single Voltage Output : 0V to 5V

Operation Temperature Range : 0 to 70

TYPICAL APPLICATIONS

DVD

CDP

General purpose Digital to Analog Conversion

FUNCTIONAL BLOCK DIAGRAM

D[6]

VOUT

D[7]

D[2]

D[3]

D[4]

D[5]

D[0]

D[1]

VRB

VRT

R2R

LADDER

AMP

Rev 2.1 (Apr. 2002)
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 datasheet is subject to change without any notice.

8-BIT 0.5MSPS DAC

AL1213A

CORE PIN DESCRIPTION

Name

I/O Type

I/O Pad

Pin Description

DI0 ~ DI7

picc_bb

Digital Input Data

VRB

pia_bb

Voltage Reference Bottom (0V)

VRT

pia_bb

Voltage Reference Top (5V)

AOUT

poa_bb

Analog Voltage Output

VDDA

vdda

Analog Power

VSSA

vssa

Analog Ground

VBB

vbb

Analog Ground

I/O TYPE ABBR

AI : Analog Input

DI : Digital Input

AO : Analog Output

DO : Digital Output

AP : Analog Power

AG : Analog Ground

AB : Analog bi-direction port

DB : Digital Bidirection port

DP : Digital Power

DG : Digital Ground

DB : Digital Sub Bias

AL1213A

8-BIT 0.5MSPS DAC

CORE CONFIGURATION

al1213a

D[7:0]

VOUT

VSSA

VDDA

VBB

VRT

VRB

ABSOLUTE MAXIMUM RATINGS

Characteristics

Symbol

Typ

Unit

Supply Voltage

VDDA

Reference Input Voltage

VRT
VRB

5.0
0.0

V
V

Digital Input Voltage HIGH
LOW

Vinh

Vinl

5.0
0.0

V
V

Operating Temperature

Top

0 to 70

NOTES

ABSOLUTE

MAXIMUM

RATING

specifies

the

values

beyond

which

the

device

may

damaged

permanently.

Exposure

ABSOLUTE

MAXIMUM

RATINGS

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

VSSA, VDDD

unless

otherwise

specified.

8-BIT 0.5MSPS DAC

AL1213A

RECOMMENDED OPERATING CONDITIONS

Characteristics

Symbol

Min

Typ

Max

Unit

Supply Voltage

VDDA

4.75

5.0

5.25

Reference Input Voltage

VRT
VRB

-
-

5.0
0.0

-
-

V
V

Digital Input Voltage HIGH
LOW

Vinh

Vinl

0.7 VDDD

-
-

0.3 VDDD

V
V

Operating Temperature

Top

NOTE: It is strongly recommended that to avoid power latch-up all the supply pins (VDDA, VDDD) be driven from the

same source.

DC ELECTRICAL CHARACTERISTICS

(Converter Specifications : VDDA = 5V, VSSA = VBB = 0V, Top = 25

C, VRT = 5.0V, VRB = 0.0V Cload = 2pF

unless otherwise specified.)

Characteristics

Symbol

Min

Typ

Max

Unit

Resolution

Bits

Differential Linearity Error

DLE

0.4

LSB

Integral Linearity Error

ILE

0.8

LSB

Maximum Output Voltage

4.75

5.25

LSB Size

19.0

19.5

AL1213A

8-BIT 0.5MSPS DAC

AC ELECTRICAL CHARACTERISTICS

(Converter Specifications : VDDA = 5V, VSSA = VBB = 0V, Top = 25

C, VRT = 5.0V, VRB = 0.0V Cload = 2pF

unless otherwise specified.)

Characteristics

Symbol

Min

Typ

Max

Unit

Test Conditions

Conversion Rate

0.5

MSPS

data = 0.5MHz

Dynamic Supply Current

Ivdd

1.5

2.3

7.0

fc = 0.5MHz

(load cap = 25pF)

Analog Output Delay

190

270

fc = 0.5MHz

Data : All High

Analog Output Rise Time

230

300

fc = 0.5MHz

Data : All Low

All High

Analog Output Fall Time

230

300

fc = 0.5MHz

Data : All High

All Low

Center Code Rising Time

Trd

0.3

0.4

fc = 0.5MHz

Data :

01111111

10000000

Power down on time

Tpon

Data : 11111111

Power down off time

Tpof

240

Data : 11111111

Power down current

Ipd

Data : 11111111

PD : 0V

8-BIT 0.5MSPS DAC

AL1213A

TIMING DIAGRAM

D[0]-D[7]

DATA

VOUT

1LSB

D[0]-D[7]

VOUT

90%

50%

10%

Tpon

Tpof

+/- 1/2LSB

1. Output delay measured from the 50% point of the rising edge of input data to the full scale transition.

2. Settling time measured from the 50% point of full scale transition to the output remaining within

1/2 LSB.

3. Output rise/fall time measured between the 10% and 90% points of full scale transition.

FUNCTION DESCRIPTION

The AL1213A has a R-2R Ladder Block for 8bit and an Opamp Block for driving Output.

The R-2R Ladder Block generates binary weighted voltage (VRT/2

VRT/2

. . . VRT/2

)

corresponding to Digital Input Data for n-bit DAC and Output total voltage is summing of each values.

In Output voltage, MSB = VRT/21 LSB = VRT/2n

Output of the R2R Ladder Block is driven by Opamp

8-BIT 0.5MSPS DAC

AL1213A

TESTABILITY

Whether you use MUX or the internal logic for testability, it is required to be able to select the values of digital
inputs (D[0] ~ D[7]). See above figure. Only if it is, you can check the main function (Linearity)

PHANTOM CELL INFORMATION

VOUT

AL1213A

VRT

VRB

D[0]

D[1]

D[2]

D[3]

D[4]

D[5]

D[6]

D[7]

VSSA

VBB

VDDA

Pin Name

Property

Pin Usage

Pin Layout Guide

D[7:0]

Internal / External

1. Digital Input Signal lines must have same length to

Internal / External

reduce propagation delay.

VRT

Internal / External

1. Voltage reference lines (VRT / VRB) must be wide metal
to reduce voltage drop of metal lines

VRB

Internal / External

2. VOUT signal should not be crossed by any signals and
should not run next to digital signals to minimize capacitive

VOUT

Internal / External

coupling between the two signals.

VDDA

External

1. It is recommended that you use thick analog power
metal.

VSSA

External

When connected to PAD, the path should be kept as short

VBB

External

as possible.

When the core block is connected to other blocks, it must be double guard-ring using N-well and
P+ active to remove the substrate and coupling noise.
In that case, the power metal should be connected to PAD directly.

2. The Bulk power is used to reduce the influence of substrate noise.

AL1213A

8-BIT 0.5MSPS DAC

PACKAGE CONFIGURATION

AL1213A

VSSA

D[7]

D[6]

D[5]

D[4]

D[3]

D[2]

VRB

VRT

AOUT

D[1]

VDDA

VBB

VDDA

D[0]

VOUT

D[1]

D[2]

D[3]

D[4]

D[5]

D[6]

D[7]

D[0]

VRT(5V)

VRB(0V)

Location

Description

10mF TANTALUM CAPACITOR

0.1mF CERAMIC CAPACITOR

L1,L2

FERRITE BEAD ( 0.1mh )

8-BIT 0.5MSPS DAC

AL1213A

PACKAGE PIN DESCRIPTION

Name

Pin No

I/O Type

Pin Description

VDDA

1,4

Analog Power

VBB

Analog Ground

VSSA

Analog Ground

DI0 ~ DI7

8 ~ 15

Digital Input Data

VRB

Voltage Reference Bottom (0V)

VRT

Voltage Reference Top (5V)

AOUT

Analog Voltage Output

2,6,7,16,17,18

19,20,21,25,26

27,28

No Connection

PC BOARD LAYOUT CONSIDERATIONS

PC Board Considerations

To minimize noise on the power lines and the ground lines, the digital inputs need to be shielded and decoupled.
This trace length between groups of VDD (VDDA, VDDD) and VSS (VSSA, VSSD) pins should be as short as
possible so as to minimize inductive ringing.

Supply Decoupling and Planes

For the decoupling capacitor between the power line and the ground line, 0.1mF ceramic capacitor is used in
parallel with a 10mF tantalum capacitor. The digital power plane (VDDD) and analog power plane (VDDA) are
connected through a ferrite bead, and also the digital ground plane (VSSD) and the analog

ground plane (VSSA). This ferrite bead should be located within 3inches of the AL1213A. The analog power
plane supplies power to the AL1213A of the analog output pin and related devices.

AL1213A

8-BIT 0.5MSPS DAC

FEEDBACK REQUEST

We appreciate your interest in out products. If you have further questions, please specify in the attached form.
Thank you very much.

DC/AC Electrical Characteristic

Characteristics

Min

Typ

Max

Unit

Remarks

Supply

Voltage

Power

dissipation

Resolution

Bits

Analog

Output

Voltage

Operating

Temperature

Output

Load

Capacitor

Output

Load

Resistor

Integral

Non-Linearity

Error

LSB

Differential

Non-Linearity

Error

LSB

Maximum

Conversion

Rate

MHz

Voltage Output DAC

Characteristics

Min

Typ

Max

Unit

Remarks

Reference Voltage TOP
BOTTOM

Analog Output Voltage Range

Digital Input Format

Binary Code or 2's Complement Code

Current Output DAC

Characteristics

Min

Typ

Max

Unit

Remarks

Analog

Output

Maximum

Current

Analog

Output

Maximum

Signal

Frequency

MHz

Reference

Voltage

External

Resistor

for

Current

Setting (RSET)

Pipeline

Delay

sec

Do you want to Power down mode?

Do you want to Internal Reference Voltage (BGR)?

Which do you want to Serial Input TYPE or parallel Input TYPE?

Do you need 3.3V and 5V power supply in your system?

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