Philips tda8718 DATASHEETS

INTEGRATED CIRCUITS

DATA SH EET

TDA8718

8-bit high-speed analog-to-digital converter

Product speciﬁcation Supersedes data of April 1993 File under Integrated Circuits, IC02

Philips Semiconductors

June 1994

Philips Semiconductors Product speciﬁcation

8-bit high-speed analog-to-digital converter TDA8718

FEATURES

• 8-bit resolution

• Sampling rate up to 600 MHz

• ECL (100K family) compatible for digital inputs and

outputs

• Overflow/Underflow output

GENERAL DESCRIPTION

The TDA8718 is an 8-bit analog-to-digital converter (ADC) designed for professional applications. The device converts the analog input signal into 8-bit binary coded digital words at a sampling rate of 600 MHz. It has an effective bandwidth capability up to 150 MHz full-scale sine wave. All digital outputs are ECL compatible.

• 50 Ω load drive capability

• Low input capacitance (5 pF typ.).

APPLICATIONS

• High speed analog-to-digital conversion

• Industrial instrumentation

• Data communication

• RF communication.

QUICK REFERENCE DATA

Measured over full voltage and temperature ranges, unless otherwise speciﬁed.

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

V

EEA

V

EED

I

ref

I

EEA

I

EED

I

EEO(L)

I

EEO(H)

analog supply voltage −4.2 −4.5 −4.8 V digital supply voltage −4.2 −4.5 −4.8 V resistive ladder current R = 48 Ω 30 45 60 mA analog supply current 30 42 54 mA digital supply current 100 120 150 mA LOW level output supply current RL = 50 Ω 40 70 90 mA

HIGH level output supply current RL = 50 Ω 155 170 185 mA ILE DC integral linearity error −±0.7 ±1.0 LSB DLE DC differential linearity error −±0.3 ±0.5 LSB EB effective bits f

f

clk(max)

P

tot

maximum clock frequency 600 −−MHz

total power dissipation − 990 1250 mW

= 4.43 MHz; I

i

f

= 100 MHz

clk

= 4.43 MHz; I

f

i

f

= 100 MHz

clk

= 45 mA;

ref

= 45 mA;

ref

− 7.5 − bits

− 6.5 − bits

ORDERING INFORMATION

TYPE NUMBER

PINS PIN POSITION MATERIAL CODE

TDA8718K 28 PLCC28 plastic SOT261-2

June 1994 2

PACKAGE

Philips Semiconductors Product speciﬁcation

8-bit high-speed analog-to-digital converter TDA8718

BLOCK DIAGRAM

handbook, full pagewidth

reference

voltage middle

reference

voltage TOP

analog

voltage input

reference

voltage BOTTOM

analog negative

supply voltage

VRM2

V

RT

5

V

3

I

V

1

RB

V

EEA

28

8

Ω

RESISTOR

LADDER

32

Ω

ANALOG SIGNAL

PROCESSING

8

Ω

27 AGND

analog ground digital ground

CLK CLK

CLOCK DRIVER

&

24 DGND

clock inputs

INPUT

AND

OUTPUT

LATCHES

&

DIGITAL

DECODING

digital negative

supply voltage

V

EED

2389

ECL OUTPUTS

12

OGND1

TDA8718

11 V

BB

18

10 13 14 15 16 17 D2 19 20

21

MBB854 - 2

OGND2

6

OF D7

D6 D5 D4 D3

D1 D0

UF

output ground

overflow

output

MSB

data outputs

LSB

underflow

output

Fig.1 Block diagram.

June 1994 3

Philips Semiconductors Product speciﬁcation

8-bit high-speed analog-to-digital converter TDA8718

PINNING

SYMB

OL

V

RB

V

RM

V

I

PIN DESCRIPTION

1 reference voltage BOTTOM 2 reference voltage MIDDLE decoupling

3 analog input voltage n.c. 4 not connected V

RT

5 reference voltage TOP OF 6 overﬂow digital output n.c. 7 not connected CLK 8 clock input CLK 9 complementary clock input D7 10 digital output; bit 7 (MSB) V

BB

11 ECL reference voltage OGND1 12 output ground 1 (0 V) D6 13 digital output; bit 6 D5 14 digital output; bit 5 D4 15 digital output; bit 4 D3 16 digital output; bit 3 D2 17 digital output; bit 2 OGND2 18 output ground 2 (0 V) D1 19 digital output; bit 1 D0 20 digital output; bit 0 (LSB) UF 21 underﬂow digital output n.c. 22 not connected V

EED

23 digital supply voltage (−4.5 V) DGND 24 digital ground n.c. 25 not connected n.c. 26 not connected AGND 27 analog ground V

EEA

28 analog supply voltage (−4.5 V)

handbook, halfpage

V

5

RT

6

OF

7

n.c.

8

CLK

9

CLK

10

D7

V

11

BB

n.c.

4

I

V

3

V

V 2

AGND

1

28

27

EEA

RM

RB

TDA8718

12

13

14

15

16

17

D6

OGND1

D5D4D3

D2

Fig.2 Pin configuration.

n.c. 26

18

MBB850 - 2

OGND2

25

n.c.

24

DGND V

23

EED

n.c.

22 21

UF D0

20 19

D1

June 1994 4

Philips Semiconductors Product speciﬁcation

8-bit high-speed analog-to-digital converter TDA8718

LIMITING VALUES

In accordance with the Absolute Maximum Rating System (IEC 134).

SYMBOL PARAMETER CONDITIONS MIN. MAX. UNIT

V

EEA

V

EED

∆V

EE

V

I

∆V

clk(p-p)

I

O

T

stg

T

amb

T

j

analog supply voltage (pin 28) −7.0 +0.3 V digital supply voltage (pin 23) −7.0 +0.3 V supply voltage difference between V

and V

EED

EEA

input voltage (pin 3) referenced to AGND V clock input voltage difference between

CLK and CLK pin 8 to pin 9

referenced to V note 1

EED

;

−1.00 +1.0 V

EEA

0V

− 2.0 V

(peak-to-peak value) output current for each digital output − 30 mA storage temperature −55 +150 °C operating ambient temperature 0 +70 °C junction temperature − +150 °C

Note

1. The circuit has two clock inputs CLK and

CLK. Sampling takes place on the falling edge of the clock input signal;

CLK and CLK are two complementary signals.

THERMAL CHARACTERISTICS

SYMBOL PARAMETER VALUE UNIT

R

th j-a

handbook, halfpage

R

∆

th j-a

(%)

0

10

20

30

40

thermal resistance from junction to ambient in free air 55 K/W

MBB851

50

Test conditions: PCB (2.24 ×2.24 ×0.062 inches). LFPM = Linear Foot Per Minute.

Fig.3 Average effect of air flow on R

200 400 600 800

0 1000

airflow (LFPM)

.

th j-a

June 1994 5