--1--

E89X38F01

Sony reserves the right to change products and specifications without prior notice. This information does not convey any license by
any implication or otherwise under any patents or other right. Application circuits shown, if any, are typical examples illustrating the
operation of the devices. Sony cannot assume responsibility for any problems arising out of the use of these circuits.

Absolute Maximum Ratings (Ta=25 °C)

· Supply voltage

, DV

· Input voltage (All pins)

+0.5 to V

0.5 V

· Output current

OUT

· Storage temperature

Tstg

55 to +150

°C

Recommended Operating Conditions

· Supply voltage

, AV

4.75 to 5.25

, DV

4.75 to 5.25

· Reference input voltage

REF

2.0

· Clock pulse width

Tpw

,Tpw

11.2 ns (min) to 1.1 µs (max)

· Operating temperature

Topr

40 to +85

°C

Description

The CXD1171M is a 8-bit 40 MHz high speed D/A

converter. The adoption of a current output system

reduces power consumption to 80 mW (200

load

at 2 Vp-p output).

This IC is suitable for digital TV and graphic

display applications.

Features

· Resolution 8-bit

· Max. conversion speed 40MSPS

· Non linearity error within ±0.25 LSB

· Low glitch noise

· TTL CMOS compatible input

· +5 V single power supply

· Low power consumption 80 mW

(200

load at 2 Vp-p output)

Function

8-bit 40 MHz D/A converter

Structure

Silicon gate CMOS IC

8-bit 40MSPS High Speed D/A Converter

24 pin SOP (Plastic)

CXD1171M

--2--

CXD1171M

Block Diagram and Pin Configuration

6MSB'S

CURRENT

CELLS

LATCHES

DECODER

CLOCK

GENERATOR

CURRENT CELLS

(FOR FULL SCALE)

BIAS VOLTAGE

GENERATOR

DECODER

2LSB'S

CURRENT

CELLS

(LSB) D0

(MSB) D7

BLK

CLK

VREF

IREF

--3--

CXD1171M

Pin Description and I/O Pins Equivalent Circuit

1 to 8

10, 13

D0 to D7

BLK

CLK

No.

Symbol

I/O

Equivalent circuit

Description

Digital input.

D0 (LSB) to D7 (MSB)

D0 and D1 have a pull-down resistor.

Blanking input.

This is synchronized with the clock signal.

No signal at "H" (Output 0 V).

Output condition at "L".

Connect a capacitor of about 0.1 µF.

Clock input.

Digital ground.

Analog ground.

--4--

CXD1171M

18, 19, 22

23, 24

IREF

VREF

No.

Symbol

I/O

Equivalent circuit

Description

Set full-scale output value.

Connect a capacitor of about 0.1 µF.

Analog power supply.

Current output.

Voltage output can be obtained by connecting

a resistance.

Inverted current output.

Normally connected to analog GND.

Digital power supply.

Connect a resistor "R

" 16 times against the

output resistance value "R

OUT

" connected to

Pin 20 (IO).

--5--

CXD1171M

Electrical Characteristics Measurement Circuit

Analog Input Resistance

Measurement Circuit

Digital Input Current

CXD1171M

+5.25V

, DV

}

Electrical Characteristics

CLK

=40 MHz, AV

=DV

=5 V, R

OUT

=200

, V

REF

=2.0 V, Ta=25 °C)

Item

Resolution

Conversion speed

Integral non-linearity error

Differential non-linearity error

Output full-scale voltage

Output full-scale current

Output offset voltage

Glitch energy

Supply current

Analog input resistance

Input capacitance

Digital input voltage

Digital input current

Setup time

Hold time

Propagation delay time

Symbol

CLK

Measurement conditions

=DV

=4.75 to 5.25 V

Ta=40 to 85 °C

Endpoint

When D0 to D7=00000000 input

OUT

=75

When 14.3 MHz color bar data input

REF

=DV

=4.75 to 5.25 V

Ta=20 to +75 °C

=DV

=4.75 to 5.25 V D0, D1

Ta=20 to +75 °C

D2 to 7,

BLK,

CLK

OUT

=75

OUT

=75

Min.

0.5

0.25

1.9

2.4

Typ.

2.0

14.5

Max.

1.3

0.25

2.1

0.8

240

Unit

bit

MSPS

LSB

pV · s

µA

--6--

CXD1171M

Maximum Conversion Speed Measurement Circuit

CLK
40MH

SQUARE
WAVE

CLK

0.1µ

200

OSCILLOSCOPE

BLK

VREF

IREF

AVss

0.1µ

3.3k

D0 (LSB)

8bit

COUNTER

with

LATCH

DC Characteristics Measurement Circuit

CLK
40MH

SQUARE
WAVE

CLK

0.1µ

200

BLK

VREF

IREF

AVss

0.1µ

3.3k

D0 (LSB)

DVM

CONTROLLER

Propagation Delay Time Measurement Circuit

CLK
10MH

SQUARE
WAVE

CLK

0.1µ

200

OSCILLOSCOPE

BLK

VREF

IREF

AVss

0.1µ

3.3k

D0 (LSB)

FREQUENCY

DEMULTIPLIER

CLK
1MH

SQUARE
WAVE

CLK

0.1µ

OSCILLOSCOPE

BLK

VREF

IREF

AVss

0.1µ

1.2k

D0 (LSB)

8bit

COUNTER

with

LATCH

DELAY

CONTROLLER

DELAY

CONTROLLER

Setup Time

Hold Time

measurement Circuit

Glitch Energy

}

--7--

CXD1171M

Operation

Timing Chart

PW1

PW0

CLK

DATA

D/A OUT

100%

50%

Application Circuit

200

0.1µ

3.3k

DGND

D/A OUT

AGND

8bit

DIGITAL

INPUT

(LSB)

I/O Chart (when full-scale output voltage at 2.00 V)

Input code

MSB LSB

1 1 1 1 1 1 1 1

1 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0

Output voltage

2.0 V

1.0 V

0 V

Application circuits shown are typical examples illustrating the operation of the devices. Sony cannot assume responsibility for
any problems arising out of the use of these circuits or for any infringement of third party patent and other right due to same.

--8--

CXD1171M

Notes on Operation

· How to select the output resistance

The CXD1171M is a D/A converter of the current output type. To obtain the output voltage connect the

resistance to the current output pin IO. For specifications we have:

Output full scale voltage

= 1.9 to 2.1 [V]

Output full scale current

= less than 15 [mA]

Calculate the output resistance value from the relation of V

= I

OUT

. Also, 16 times resistance of the

output resistance is connected to reference current pin IREF. In some cases, however, this turns out to be a

value that does not actually exist. In such a case a value close to it can be used as a substitute. Here please

note that V

becomes V

= V

REF

16R

OUT

. R

OUT

is the resistance connected to IO while R

is connected

to IREF. Increasing the resistance value can curb power consumption. On the other hand glitch energy and

data settling time will inversely increase. Set the most suitable value according to the desired application.

· Phase relation between data and clock

To obtain the expected performance as a D/A converter, it is necessary to set properly the phase relation

between data and clock applied from the exterior. Be sure to satisfy the provisions of the setup time (

) and

hold time (

) as stipulated in the Electrical Characteristics.

· Power supply and ground

To reduce noise effects separate analog and digital systems in the device periphery. For the power supply

pins, both digital and analog, bypass respective grounds by using a ceramic capacitor of about 0.1 µF, as

close as possible to the pin.

· Latch up

and DV

have to be common at the PCB power supply source. This is to prevent latch up due to

voltage difference between AV

and DV

pins when power supply is turned ON.

· IO pin

The IO pin is the inverted current output pin described in the Pin Description. The sum of the currents output

from the IO pin and the IO pin becomes the constant value for any input data.

However, the performances such as the linearity error of the IO pin output current is not guaranteed.

--9--

CXD1171M

Latch Up Prevention

The CXD1171M is a CMOS IC which requires latch up precautions. Latch up is mainly generated by the lag in

the voltage rising time of AV

(Pins 18, 19 and 22) and DV

(Pins 23 and 24), when power supply is ON.

1. Correct usage

a. When analog and digital supplies are from different sources

b. When analog and digital supplies are from a common source

(i)

(ii)

+5V

CXD1171M

DIGITAL IC

+5V

CXD1171M

DIGITAL IC

+5V

CXD1171M

DIGITAL IC

--10--

CXD1171M

2. Example when latch up easily occurs

a. When analog and digital supplies are from different sources

b. When analog and digital supplies are from common source

(i)

(ii)

+5V

CXD1171M

DIGITAL IC

+5V

CXD1171M

DIGITAL IC

+5V

CXD1171M

DIGITAL IC

--11--

CXD1171M

1.0

2.0

Reference voltage vs. Output full scale voltage

Reference voltage V

REF

[V]

Output full scale voltage V

[V]

2.0

Output full-scale voltage V

[V]

1.9

2.0

Ambient temperature vs. Output full scale voltage

Ambient temperature Ta [°C]

100

Output resistance vs. Glitch energy

Output resistance R

OUT

[

]

Glitch energy GE [pV · s]

200

=DV

= 5.0V

REF

=2.0V

OUT

=200

=3.3k

=DV

=5.0V

REF

=2.0V

16R

OUT

Ta=25°C

=DV

=5.0V

OUT

=200

=3.3k

Ta=25°C

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