10-1

August 1997

HI2315

10-Bit, 80 MSPS D/A Converter

(Ultra-Low Glitch Version)

Features

· Throughput Rate . . . . . . . . . . . . . . . . . . . . . . . . . 80MHz

· Low Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .150mW

· Single Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . +5V

· Differential Linearity Error . . . . . . . . . . . . . . .

0.5 LSB

· TTL/CMOS Compatible Inputs

· Built in Bandgap Voltage Reference

· Power Down and Blanking Control Pins

· Low Glitch

· Pin Compatible with Sony CXD2306

· Direct Replacement for Sony CXD2315Q

Applications

· Wireless Communications

· Direct Digital Frequency Synthesis

· Signal Reconstruction

· Test Equipment

· High Resolution Imaging and Graphics Systems

Description

The HI2315 is a 10-bit, 80MHz, high speed, low power CMOS
D/A converter. The converter incorporates a 10-bit input data
register with current outputs. The HI2315 includes a power
down feature that reduces power consumption and a blanking
control. The on-chip bandgap reference can be used to set the
output current range of the D/A.

Pinout

HI2315

(MQFP)

TOP VIEW

Ordering Information

PART

NUMBER

TEMP.

RANGE (

PACKAGE

PKG. NO.

HI2315JCQ

-20 to 75

32 Ld MQFP

Q32.7x7-S

BLK

CLK

D0 (LSB)

D9 (MSB)

32 31 30 29 28 27 26 25

9 10 11 12 13 14 15 16

REF

File Number

4119.1

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

http://www.intersil.com or 407-727-9207

Intersil Corporation 1999

10-2

Functional Block Diagram

Pin Descriptions

PIN NO.

SYMBOL

EQUIVALENT CIRCUIT

DESCRIPTION

30 to 32

1 to 7

D0 to D9

Digital Input.

BLK

Blanking pin. No signal (0V output) at high and
output state at low.

Connect a capacitor of approximately 0.1

CLK

Clock pin.

24 IO

REF

BAND GAP

REFERENCE

BIAS VOLTAGE

GENERATOR

CURRENT CELLS

(FOR FULL SCALE)

CURRENT

CELLS

6 MSBs

CURRENT

CELLS

4 LSBs

DECODER

GENERATOR

CLOCK

(LSB) D0

BLK

CLK

LATCHES

HI2315

10-3

15, 27

Digital GND.

Analog GND.

REF

Connect resistance "16R" which is 16 times output
resistance "R".

REF

Sets output full scale value.

Connect a capacitor of approximately 0.1

20, 21

Analog V

Current Output pin. Output can be retrieved by
connecting resistance. The standard is 200

Inverted Current Output pin. Connect to GND
normally.

13, 28

Digital V

Chip Enable pin. No signal (0V output) at high makes
power consumption minimum.

REF

Independent Constant-Voltage Source Output pin
using band gap reference. Stable voltage
independent of the fluctuation for supply voltage can
be obtained by connecting to V

REF

. See Application

Circuit 2 for details.

Pin Descriptions

(Continued)

PIN NO.

SYMBOL

EQUIVALENT CIRCUIT

DESCRIPTION

HI2315

10-4

Absolute Maximum Ratings

= 25

Thermal Information

Supply Voltage (V

) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7V

Input Voltage (V

) . . . . . . . . . . . . . . . . . . .V

-0.5V to V

+ 0.5V

Output Voltage (I

OUT

). . . . . . . . . . . . . . . . . . . . . . . . . .0mA to 15mA

Operating Conditions

Supply Voltage

, AV

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.0V

0.25V

, DV

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5.0V

0.25V

Reference Input Voltage (V

REF

) . . . . . . . . . . . . . . . . . . .0.5V to 2.0V

Clock Pulse Width (t

PW1

, t

PW0

) . . . . . . . . . . . . . . . . . . 6.25ns (Min)

Temperature Range (T

OPR

) . . . . . . . . . . . . . . . . . . . . -20

C to 75

Thermal Resistance (Typical, Note 1)

(

C/W)

MQFP Package . . . . . . . . . . . . . . . . . . . . . . . . . . . .

122

Maximum Junction Temperature (MQFP Package) . . . . . . . . 150

Maximum Storage Temperature Range . . . . . . . . . .-65

C to 150

Maximum Lead Temperature (Soldering 10s) . . . . . . . . . . . . . 300

(MQFP - Lead Tips Only)

CAUTION: Stresses above those listed in "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress only rating and operation
of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied.

NOTE:

is measured with the component mounted on an evaluation PC board in free air.

Electrical Specifications

= 25

C, f

CLK

= 80MHz, V

= 5V, R = 200

, V

REF

= 2.0V, 16R = 3.3k

PARAMETER

SYMBOL

TEST CONDITIONS

MIN

TYP

MAX

UNITS

Resolution

Bit

Maximum Conversion Rate

MAX

MHz

Linearity Error

-1.5

1.5

LSB

Differential Linearity Error

-0.5

0.5

LSB

Output Full-Scale Voltage

1.8

1.94

2.0

Output Full-Scale Current

9.0

9.7

Output Off-Set Voltage

Output Impedance

300

Supply Current

Digital Input Current

High Level

Low Level

-5

Digital Input Voltage

High Level

2.45

Low Level

0.85

Accuracy Guarantee Output Voltage Range

1.8

1.94

2.0

Setup Time

3.0

Hold Time

3.0

Rise Time

5.0

Propagation Delay Time

Glitch Energy

OUT

= 200

, 2V

P-P

pV/s

Differential Gain

1.0

Differential Phase

1.0

Degrees

REF

Output Voltage

REF

= 25

1.0

1.2

1.4

HI2315

10-5

Test Circuits

FIGURE 1. MAXIMUM CONVERSION RATE TEST CIRCUIT

FIGURE 2. DC CHARACTERISTICS TEST CIRCUIT

FIGURE 3. PROPAGATION DELAY TIME TEST CIRCUIT

FIGURE 4. SETUP HOLD TIME AND GLITCH ENERGY TEST CIRCUIT

0.1

200

0.1

3.3K

REF

D0 (LSB)

D9 (MSB)

CLK

BLK

10-BIT

COUNTER

WITH

LATCH

CLK

80MHz (MAX)

SQUARE

WAVE

OSCILLOSCOPE

0.1

200

0.1

3.3K

REF

D0 (LSB)

D9 (MSB)

CLK

BLK

CLK

80MHz

SQUARE

WAVE

DVM

CONTROLLER

0.1

200

0.1

3.3K

REF

D0 (LSB)

D9 (MSB)

CLK

BLK

FREQUENCY

DEMULTIPLIER

CLK

10MHz (MAX)

SQUARE

WAVE

OSCILLOSCOPE

0.1

200

0.1

3.3K

REF

D0 (LSB)

D9 (MSB)

CLK

BLK

10-BIT

COUNTER

WITH

LATCH

CLK

1MHz

SQUARE

WAVE

OSCILLOSCOPE

DELAY

CONTROLLER

DELAY

CONTROLLER

HI2315

10-6

Timing Diagram

PW1

PW0

DATA

D/A OUT

100%

50%

CLK

TABLE 1. I/O CORRESPONDENCE TABLE

(2.00V Output Full Scale Voltage)

INPUT CODE

OUTPUT VOLTAGE

MSB

LSB

2.0V

1.0V

Typical Application Circuits

NOTE:

2. When 5.0V supply voltage (DV

and AV

). Digital input from pins 30 to 32 and pins 1 to 7. Pin 18 is Left Open When Using Normally.

R1 = 200

R2 = 3.3

(Resistance 16 Times R1), R3 = 3.0k

, R4 = 2.0k

C = 0.1

FIGURE 5. APPLICATION CIRCUIT 1

CLK

BLK

REF

IO VG

CLOCK INPUT

HI2315

10-7

NOTE:

3. When 5.0V supply voltage (DV

and AV

). Digital input from pins 30 to 32 and pins 1 to 7. R1 = 200

R2 = 2.0k

, C = 0.1

FIGURE 6. APPLICATION CIRCUIT 2

Typical Application Circuits

(Continued)

CLK

BLK

REF

IO VG

CLOCK INPUT

Typical Performance Curves

FIGURE 7. OUTPUT FULL SCALE VOLTAGE (V

) vs

REFERENCE VOLTAGE (V

REF

)

FIGURE 8. OUTPUT FULL SCALE VOLTAGE vs AMBIENT

TEMPERATURE

2.0

1.0

2.0

1.0

OUTPUT FULL SCALE V

GE (V)

REFERENCE VOLTAGE (V)

-25

AMBIENT TEMPERATURE (

1.93

1.95

OUTPUT FULL SCALE V

GE (V)

V = 0.2mV/

HI2315

10-8

GE (Glitch Energy)

GE, as described in the HI2315, is a spike noise which
appears synchronizing with the clock falling edge when the
input data (for 1 to 1024 input) changes to 128, 256, 384,
512, 640, 768, 896, and 1024. Figure 11 shows the change
state of GE for the staircase wave output, and Figure 12

shows the repetitive output waveform where the GE
appears. These figures exhibit the difference of this IC from
the convention device.

The HI2315 reduces the GE as shown in Figures 11 and 12.

FIGURE 9. S

REF

vs AMBIENT TEMPERATURE

FIGURE 10. OUTPUT FREQUENCY vs CURRENT CONSUMPTION

NOTE:

4. Standard Measurement Conditions and Description: V

= 5.0V, V

REF

= 2.0V, R = 200

, 16R - 3.3k

, T

= 25

C. The temperature

characteristics of external input data in Figure 10 = all "0" and "1" of rectangular wave; clock frequency = 80MHz.

Typical Performance Curves

(Continued)

-25

AMBIENT TEMPERATURE (

1.15

1.25

REF

OUTPUT V

GE (V)

V = 0.7mV/

OUTPUT FREQUENCY (MHz)

CURRENT CONSUMPTION (mA)

DIGITAL INPUT (V)

ANALOG OUTPUT (V)

512

1024

2.0

1.0

CLK

HI2315

CONVENTIONAL
DEVICE

FIGURE 11. CHANGE OF GE FOR STAIRCASE WAVE OUTPUT

HI2315

10-9

Notes On Operation

· Selecting the Output Resistance

- HI2315 is a current output type D/A converter. To create

the output voltage, connect the resistor to the current
output pin.

Specifications:
Output full-scale voltage V

(Max) = 2.0V

Output full-scale current I

(Max) = 10mA

- Calculate the output resistance from V

= I

x R.

Connect a resistance sixteen times the output
resistance to the reference current pin I

REF

. In some

cases, as this value may not exist, a similar value can
be used instead.

Note that the V

will be the following:

= V

REF

x 16 R/R'.

- R is the resistor to be connected to the IO and R' is the

resistor to be connected to the I

REF

. Power consump-

tion can be reduced by increasing the resistance, but
this will on the contrary increase the glitch energy and
data settling time. Set the best values according to the
purpose of use.

· Correlation between Data and Clock

- For the HI2315 to display the desired performance as a

D/A converter, the data transmitted form outside and the
clock must be synchronized properly. Adjust the setup
time (t

) and hold time (t

) as specified in "Electrical

Characteristics."

· V

, V

- Separate the analog and digital signals around the

device to reduce noise effects. By-pass the V

pin to

each GND with a 0.1

F ceramics capacitor as near to

the pin as possible for both the digital and analog
signals.

· Latch up

- The AV

and DV

pins must be able to share the

same power supply of the board. This is prevent latch
up caused by potential difference between the two pins
when the power is turned on.

· I

REF

- The I

REF

pin is very sensitive to improve the AC

characteristics. Pay attention for capacitance
component not to attach to this pin because its output
may become unstable.

· VG Pin

- It is recommended to use a 1

F capacitor to improve

the AC characteristics though the typical capacitance
value externally connected to the VG pin is 0.1

· S

REF

- The S

REF

is independent regulated current source. By

connecting it to the V

REF

, stable output amplitudes that

do not depend on fluctuations in the power supply can
be obtained.

- In this case, as V

= S

REF

x 16R/R', set the V

according to R'.

- Do not use this pin as a reference power supply for

other ICs because this is dedicated for the D/A
converter.

FIGURE 12. REPETITIVE OUTPUT WAVEFORM WHERE GE APPEARS (FOR 200

, 2V

P-P

OUTPUT)

HI5780 (GE TYP = 200pV/S)

HI2315 (GE TYP = 10pV/S)

HI2315

All Intersil semiconductor products are manufactured, assembled and tested under ISO9000 quality systems certification.

Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design and/or specifications at any time without
notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate
and reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which
may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries.

For information regarding Intersil Corporation and its products, see web site http://www.intersil.com

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