Philips TDA8705T-C3, TDA8705T-C2, TDA8705T-C1 Datasheet

DATA SH EET

Product specification
Supersedes data of November 1994
File under Integrated Circuits, IC02

1996 Jan 12

INTEGRATED CIRCUITS

TDA8705

6-bit high-speed dual
Analog-to-Digital Converter (ADC)

1996 Jan 12 2

Philips Semiconductors Product specification

6-bit high-speed dual Analog-to-Digital
Converter (ADC)

TDA8705

FEATURES

• 2 times 6-bit resolution

• Sampling rate up to 40 MHz

• High signal-to-noise ratio over a large analog input

frequency range (5.8 effective bits at 10 MHz full-scale
input at f

clk

= 40 MHz

• TTL output

• Two separated inputs (AC-coupling)

• TTL compatible digital inputs

• Low-level AC clock input signal allowed

• Internal reference voltage regulator

(external reference regulation possible)

• Power dissipation only 250 mW (typical)

• Low analog input capacitance, no buffer amplifier

required

• No sample-and-hold circuit required.

APPLICATIONS

High-speed analog-to-digital conversion for:

• DBS (Digital Broadcast Satellite)

• QPSK (Quadrature Phase Shift Keying) demodulation

• Video.

GENERAL DESCRIPTION

The TDA8705 is a 6-bit high-speed dual analog-to-digital
converter (ADC) for satellite video and other applications.
It converts the two analog input signals into two 6-bit
binary-coded digital words at a maximum sampling rate of
40 MHz. All digital inputs and outputs are TTL compatible,
although a low-level sine wave clock input signal is
allowed.

QUICK REFERENCE DATA

Note

1. Full-scale sine wave (f

i

= 10 MHz; f

clk

= 40 MHz).

ORDERING INFORMATION

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

V

CCA

analog supply voltage 4.75 5.0 5.25 V

V

CCD

digital supply voltage 4.75 5.0 5.25 V

V

CCO

output stages supply voltage 4.75 5.0 5.25 V

I

CCA

analog supply current 20 27 32 mA

I

CCD

digital supply current 10 14 18 mA

I

CCO

output stages supply current 10 14 18 mA
ILE DC integral linear error −±0.25 ±0.5 LSB
DLE DC differential linearity error −±0.25 ±0.5 LSB
AILE AC integral linearity error note 1 −±0.5 ±1.0 LSB
f

clk(max)

maximum clock frequency 40 −−MHz
P

tot

total power dissipation − 250 − mW

TYPE

NUMBER

PACKAGE

NAME DESCRIPTION VERSION

TDA8705T SO28 plastic small outline package; 28 leads; body width 7.5 mm SOT136-1

1996 Jan 12 3

Philips Semiconductors Product specification

6-bit high-speed dual Analog-to-Digital

Converter (ADC)

TDA8705

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BLOCK DIAGRAM

handbook, full pagewidth

7
AGND

10

DEC

V

RTA

V

CCA

V

CCD

V

CCO

17

18

19

16 D1B

D2B

D3B

D4B

1520D0B

D5B

TTL OUTPUTS

LATCHES

ANALOG -TO-DIGITAL

CONVERTER

B

MLC113

TDA8705

analog ground

data

outputs

LSB

MSB

6

25

26

27

24 D1A

D2A

D3A

D4A

2328D0A

D5A

TTL OUTPUTS

LATCHES

ANALOG -TO-DIGITAL

CONVERTER

A

data

outputs

LSB

MSB

6

9

5

12
14

REGULATOR

CLOCK DRIVER

V

RBA

V

RMA

V

RTB

V

RMB

4

V

IA

R

INTA

R

INTB

6

V

RBB

13

V

IB

11

8 2 21

3
DGND

1

CLK

digital ground

22
OGND

output ground

reference

voltage TOP

A

reference

voltage TOP

B

analog

voltage input

A

reference

voltage BOTTOM

A

analog

voltage input

B

reference

voltage BOTTOM

B

reference

voltage MIDDLE

A

reference

voltage MIDDLE

B

Fig.1 Block diagram.

1996 Jan 12 4

Philips Semiconductors Product specification

6-bit high-speed dual Analog-to-Digital
Converter (ADC)

TDA8705

PINNING

SYMBOL PIN DESCRIPTION

CLK 1 clock input
V

CCD

2 digital supply voltage (+5 V)
DGND 3 digital ground
V

RBA

4 reference voltage BOTTOM for

ADC A (decoupling)

V

RTA

5 reference voltage TOP for ADC A

(decoupling)

V

IA

6 analog input voltage for ADC A
AGND 7 analog ground
V

CCA

8 analog supply voltage (+5 V)
V

RMA

9 reference voltage MIDDLE for ADC A

(decoupling)
DEC 10 decoupling input
V

IB

11 analog input voltage for ADC B

V

RTB

12 reference voltage TOP for ADC B

(decoupling)
V

RBB

13 reference voltage BOTTOM for

ADC B (decoupling)
V

RMB

14 reference voltage MIDDLE for ADC B

(decoupling)
D0B 15 data output; bit 0 (LSB), ADC B
D1B 16 data output; bit 1, ADC B
D2B 17 data output; bit 2, ADC B
D3B 18 data output; bit 3, ADC B
D4B 19 data output; bit 4, ADC B
D5B 20 data output; bit 5 (MSB), ADC B
V

CCO

21 supply voltage for output stages

(+5 V)
OGND 22 output ground
D0A 23 data output; bit 0 (LSB), ADC A
D1A 24 data output; bit 1, ADC A
D2A 25 data output; bit 2, ADC A
D3A 26 data output; bit 3, ADC A
D4A 27 data output; bit 4, ADC A
D5A 28 data output; bit 5 (MSB), ADC A

Fig.2 Pin configuration.

handbook, halfpage

1
2
3
4
5
6
7
8

9
10
11
12
13

28
27
26
25
24
23
22
21

20
19
18
17
16
1514

TDA8705

CLK

DGND

V

IA

V

CCD

V

RBA

V

RTA

V

RMA

V

IB

V

RTB

V

RBB

V

RMB

V

CCA

AGND

DEC

D5B
D4B
D3B

D2B
D1B

D0B

D3A

D2A
D1A
D0A

V

CCO

OGND

D5A
D4A

MLC114

1996 Jan 12 5

Philips Semiconductors Product specification

6-bit high-speed dual Analog-to-Digital
Converter (ADC)

TDA8705

LIMITING VALUES

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

Note

1. The supply voltages V

CCA

, V

CCO

and V

CCD

may have any value between −0.3 V and +7.0 V provided the difference

between V

CCA

, V

CCO

and V

CCD

is between −1 V and +1 V.

HANDLING

Inputs and outputs are protected against electrostatic discharges in normal handling. However, to be totally safe, it is
desirable to take normal precautions appropriate to handling integrated circuits.

THERMAL CHARACTERISTICS

SYMBOL PARAMETER CONDITIONS MIN. MAX. UNIT

V

CCA

analog supply voltage note 1 −0.3 +7.0 V

V

CCD

digital supply voltage note 1 −0.3 +7.0 V

V

CCO

output stages supply voltage note 1 −0.3 +7.0 V

∆V

CC

supply voltage differences
between V

CCA

and V

CCD

−1.0 +1.0 V

∆V

CC

supply voltage differences
between V

CCO

and V

CCD

−1.0 +1.0 V

∆V

CC

supply voltage differences
between V

CCA

and V

CCO

−1.0 +1.0 V

V

I

input voltage referenced to AGND −0.3 +7.0 V

V

clk(p-p)

AC input voltage for switching
(peak-to-peak value)

referenced to DGND − V

CCD

V

I

O

output current − 10 mA

T

stg

storage temperature −55 +150 °C

T

amb

operating ambient temperature 0 +70 °C

T

j

junction temperature − +150 °C

SYMBOL PARAMETER VALUE UNIT

R

th j-a

thermal resistance from junction to ambient in free air 70 K/W