Philips tda8784 DATASHEETS

INTEGRATED CIRCUITS

DATA SH EET

TDA8784

18 Msps, 10-bit analog-to-digital
interface for CCD cameras

Product specification
Supersedes data of 1998 Aug 05
File under Integrated Circuits, IC02

1999 Sep 21

Philips Semiconductors Product specification

18 Msps, 10-bit analog-to-digital
interface for CCD cameras

FEATURES

• Correlated Double Sampling (CDS), AGC, 10-bit ADC
and reference regulator included,adjustable bandwidth
(CDS and AGC)

• Fully programmable via a 3-wire serial interface

• Sampling frequency up to 18 MHz

• AGC gain from 4.5 to 34.5 dB (in 0.1 dB steps)

• CDS programmable bandwidth from 4 to 120 MHz

• AGC programmable bandwidth from 4 to 54 MHz

• Standby mode available for each block for power saving

applications (20 mW typical)

• 6 dB fixed gain analog output for analog iris control

• 8-bit and 10-bit DAC included for analog settings

• Low power consumption of only 483 mW typical

• 5 V operation and 2.5 to 5.25 V operation for the digital

outputs

• TTL compatible inputs, TTL and CMOS compatible
outputs.

TDA8784

APPLICATIONS

• CCD camera systems.

GENERAL DESCRIPTION

The TDA8784 is a 10-bit analog-to-digital interface for
CCD cameras. The device includes a correlated double
sampling circuit, AGC and a low-power 10-bit
Analog-to-Digital Converter (ADC) together with its
reference voltage regulator.

The AGC and CDS have a bandwidth circuit controlled by
on-chip DACs via a serial interface.

A 10-bit DAC controls the ADC input clamp level.
An additional 8-bit DAC is provided for additional system

controls; its output voltage range is 1.4 V (p-p) which is
available at pin OFDOUT.

ORDERING INFORMATION

TYPE

NUMBER

TDA8784HL LQFP48 plastic low profile quad flat package; 48 leads; body 7 × 7 × 1.4 mm SOT313-2

NAME DESCRIPTION VERSION

PACKAGE

1999 Sep 21 2

Philips Semiconductors Product specification

18 Msps, 10-bit analog-to-digital

TDA8784

interface for CCD cameras

QUICK REFERENCE DATA

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

V

CCA

V

CCD

V

CCO

I

CCA

I

CCD

I

CCO

ADC

res

V

i(CDS)(p-p)

G

CDS

f

CLK(max)

AGC

dyn

N

tot(rms)

E

in(rms)

P

tot

analog supply voltage 4.75 5 5.25 V
digital supply voltage 4.75 5 5.25 V
digital outputs supply voltage 2.5 3 5.25 V
analog supply current − 78 85 mA
digital supply current − 18 20 mA
digital outputs supply current f

= 18 MHz;

CLK

− 1 − mA

CL= 20 pF; ramp input
ADC resolution − 10 − bits
CDS input voltage (peak-to-peak value) − 400 1200 mV
CDS output amplifier gain − 6 − dB
maximum clock frequency f

cut(CDS)

f

cut(AGC)

= 120 MHz;
= 54 MHz

18 −−MHz

AGC dynamic range − 30 − dB
total output noise from CDS input to

ADC output (RMS value)

gain = 4.5 dB;

f

cut(CDS)

f

cut(AGC)

= 120 MHz;
= 40 MHz

− 0.125 − LSB

equivalent input noise (RMS value) gain = 34.5 dB − 125 −µV
total power consumption − 483 550 mW

1999 Sep 21 3

Philips Semiconductors Product specification

18 Msps, 10-bit analog-to-digital
interface for CCD cameras

BLOCK DIAGRAM

V

handbook, full pagewidth

CPCDS
AGND1

IND INP AGND3 SHD SHP CLPDM CLK

47

TRACK-

AND-HOLD

8
5

4-BIT DAC

CUT-OFF

CCA3

454846

TRACK-

AND-HOLD

TRACK-

AND-HOLD

CLAMP

CLAMP

ref1

CLPOB

1

DGND2

CLOCK

GENERATOR

V

CCD2

OE

TDA8784

V

CCO

3738394041424344

36

35

34

33

32

OGND

D9

D8

D7

D6

AMPOUT

AGND4

AGCOUT

V

CCA1

AGND5

ADCIN

V

ref

CLPADC

31

30

29

28

27

26

25

3

D5

D4

D3

D2

D1

D0

DGND1

OFDOUT

MGM505

4
2

6 dB

10-BIT ADC

OUTPUTS

BUFFER

TDA8784

7

6
9
10

12

11

1

1

4-BIT DAC

CUT-OFF

10-BIT DAC

14

13 15 16 17 18

AGND2

V

CCA2

DACOUT

AGC

9-BIT DAC

REGULATOR

V

RT

V

RB

DEC1

STDBY

INTERFACE

2319

SENAGND6

SERIAL

21

22

SDATA

SCLK

20

8-BIT DAC

V

CCD1

24

Fig.1 Block diagram.

1999 Sep 21 4

Philips Semiconductors Product specification

18 Msps, 10-bit analog-to-digital

TDA8784

interface for CCD cameras

PINNING

SYMBOL PIN DESCRIPTION

CLPOB 1 clamp pulse input at optical black
AGND4 2 analog ground 4
OFDOUT 3 analog output of the additional 8-bit control DAC (controlled via the serial interface)
AMPOUT 4 CDS amplifier output (fixed gain = 6 dB)
AGND1 5 analog ground 1
V

CCA1

AGCOUT 7 AGC amplifier signal output
CPCDS 8 clamp storage capacitor pin
AGND5 9 analog ground5
ADCIN 10 ADC analog signal input from AGCOUT via a short circuit
CLPADC 11 clamp control input for ADC analog input signal clamp (used with a capacitor from V
V

ref

DACOUT 13 DAC output for ADC clamp level
AGND2 14 analog ground 2
V

CCA2

V

RB

V

RT

DEC1 18 decoupling 1 (decoupled to ground via a capacitor)
AGND6 19 analog ground 6
SDATA 20 serial data input for the 4 control DACs (9-bit DAC for AGC gain, 8-bit DAC for frequency cut-off;

SCLK 21 serial clock input for the control DACs and their serial interface; see Table 1
SEN 22 enable input for the serial interface shift register (active when SEN = logic 0); see Table 1
STDBY 23 standby control pin (active HIGH); all the output bits are logic 0 when standby is enabled
V

CCD1

DGND1 25 digital ground 1
D0 26 ADC digital output 0 (LSB)
D1 27 ADC digital output 1
D2 28 ADC digital output 2
D3 29 ADC digital output 3
D4 30 ADC digital output 4
D5 31 ADC digital output 5
D6 32 ADC digital output 6
D7 33 ADC digital output 7
D8 34 ADC digital output 8
D9 35 ADC digital output 9 (MSB)
OGND 36 digital output ground
V

CCO

6 analog supply voltage 1

to ground)

ref

12 ADC input clamp reference voltage (normally connected to pin VRB or DACOUT, or shorted to

ground via a capacitor)

15 analog supply voltage 2
16 ADC reference voltage (BOTTOM) code 0
17 ADC reference voltage (TOP) code 1023

additional 8-bit DAC for OFD output voltage; 10-bit DACforADC clamp level and the standby mode
per block and edge pulse control); see Table 1

24 digital supply voltage 1

37 digital output supply voltage

1999 Sep 21 5

Philips Semiconductors Product specification

18 Msps, 10-bit analog-to-digital

TDA8784

interface for CCD cameras

SYMBOL PIN DESCRIPTION

OE 38 output enable (active LOW: digital outputs active; active HIGH: digital outputs high impedance)
V

CCD2

DGND2 40 digital ground 2
CLK 41 ADC clock input
CLPDM 42 clamp pulse input at dummy pixel
SHP 43 pre-set sample-and-hold pulse input
SHD 44 data sample-and-hold pulse input
V

CCA3

INP 46 pre-set input signal from CCD
IND 47 data input signal from CCD
AGND3 48 analog ground 3

39 digital supply voltage 2

45 analog supply voltage 3

CLPOB

AGND4
OFDOUT
AMPOUT

AGND1

V

CCA1

AGCOUT

CPCDS
AGND5

ADCIN

CLPADC

V

ref

CCA3

INP

IND
47

46

14

15

V

AGND2

CCA2

V

SHD

45

44

TDA8784H

16

17

RT

RB

V

V

AGND3
48

1
2
3
4
5
6
7
8

9
10
11
12

13

DACOUT

SHP
43

18

DEC1

CLK

CLPDM

42

41

19

20

AGND6

DGND2
40

21

SCLK

SDATA

CCD2

V

39

22

SEN

OE

V

38

24 37

23

STDBY

V

CCO

CCD1

36
35
34
33
32
31
30
29
28
27
26
25

MGM506

OGND
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
DGND1

Fig.2 Pin configuration.

1999 Sep 21 6

Philips Semiconductors Product specification

18 Msps, 10-bit analog-to-digital

TDA8784

interface for CCD cameras

LIMITING VALUES

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

SYMBOL PARAMETER CONDITIONS MIN. MAX. UNIT

V

CCA

V

CCD

V

CCO

∆V

CC

V

i

V

CLK(p-p)

I

o

T

stg

T

amb

T

j

analog supply voltage note 1 −0.3 +7.0 V
digital supply voltage note 1 −0.3 +7.0 V
output stages supply voltage note 1 −0.3 +7.0 V
supply voltage difference

between V
between V
between V

CCA
CCA
CCD

and V
and V
and V

CCD
CCO
CCO

−1.0 +1.0 V

−1.0 +4.0 V

−1.0 +4.0 V

input voltage referenced to AGND −0.3 +7.0 V
AC input voltage for switching

referenced to DGND − V

CCD

V

(peak-to-peak value)
output current − 10 mA
storage temperature −55 +150 °C
ambient temperature −20 +75 °C
junction temperature − 150 °C

Note

1. The supply voltages V

CCA

, V

CCD

and V

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

CCO

voltage difference ∆VCC remains as indicated.

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 VALUE UNIT

R

th(j-a)

thermal resistance from junction to ambient in free air 76 K/W

1999 Sep 21 7

Philips Semiconductors Product specification

18 Msps, 10-bit analog-to-digital

TDA8784

interface for CCD cameras

CHARACTERISTICS

V

CCA=VCCD

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

Supplies

V

CCA

V

CCD

V

CCO

I

CCA

I

CCD

I

CCO

Digital inputs

LOCK INPUT: CLK (REFERENCED TO DGND)

C
V

IL

V

IH

I

IL

I

IH

Z

i

C

i

INPUTS: SHP AND SHD
V

IL

V

IH

I

IL

I

IH

INPUTS: SEN, SCLK, SDATA, OE, STDBY, CLPDM, CLPOB AND CLPADC
V

IL

V

IH

I

i

Correlated Double Sampling (CDS)

V

i(CDS)(p-p)

I

CPCDS,INP,IND

t

CDS(min)

t

hd1

=5V; V

CCO

=3V; f

= 18 MHz; T

CLK

=25°C; unless otherwise specified.

amb

analog supply voltage 4.75 5 5.25 V
digital supply voltage 4.75 5 5.25 V
digital outputs supply voltage 2.5 3 5.25 V
analog supply current − 78 85 mA
digital supply current − 18 20 mA
digital outputs supply current CL= 20 pF on all data outputs;

− 1 − mA

ramp input

LOW-level input voltage 0 − 0.8 V
HIGH-level input voltage 2.0 − V
LOW-level input current V
HIGH-level input current V
input impedance f
input capacitance f

= 0.8 V −1 − +1 µA

CLK

= 2.0 V −−20 µA

CLK

= 18 MHz − 46 − kΩ

CLK

= 18 MHz − 1 − pF

CLK

CCD

LOW-level input voltage 0 − 0.8 V
HIGH-level input voltage 2.0 − V

CCD

LOW-level input current VIL= 0.6 V −−6−µA
HIGH-level input current VIH= 2.2 V − 0 −µA

LOW-level input voltage 0 − 0.8 V
HIGH-level input voltage 2.0 − V

CCD

input current −2 − +2 µA

CDS input amplitude

− 400 1200 mV

(peak-to-peak value)
input current pins 8, 46

−2 − +2 µA

and 47
CDS control pulses minimum

active time

f

i(CDS1,2)=fCLK(pix);

V

= 1200 mV (p-p)

i(CDS)

12 −−ns

black-to-white transition in
1 pixel (±1 LSB typ.);

hold time INP compared to

f

cut(CDS)

f

cut(AGC)

see Fig.5 − 1 − ns

= 40 MHz;
= 40 MHz

control pulse SHP

V

V

V

1999 Sep 21 8

Philips Semiconductors Product specification

18 Msps, 10-bit analog-to-digital

TDA8784

interface for CCD cameras

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

t

hd2

t

set(CDS)

Amplifier outputs

G

AMPOUT

Z

AMPOUT

V

AMPOUT(p-p)

V

AMPOUT(bl)

V

AGCOUT(p-p)

V

AGCOUT

Z

AGCOUT

I

AGCOUT

G

AGC(min)

G

AGC(max)

f

cut(AGC)

hold time of IND compared to

see Fig.5 − 1 − ns

control pulse SHD
CDS settling time see Fig.12; control DAC 4 bits

input code; AGC gain=0dB;
f

cut(AGC)

V

= 54 MHz;

= 1200 mV (p-p)

i(CDS)

black-to-white transition in 1
pixel (1 LSB typ.)

0000 − 12 − ns
0001 − 25 − ns
0010 − 45 − ns
0011 − 55 − ns
0100 − 105 − ns
0111 − 140 − ns
1000 − 270 − ns
1011 − 300 − ns
1111 − 365 − ns

output amplifier gain − 6 − dB
output amplifier impedance − 300 −Ω
output amplifier dynamic

− 2.4 − V

voltage (peak-to-peak value)
output amplifier black level

− 1.5 − V

voltage
AGCoutputamplifierdynamic

− 2000 − mV
voltage level (peak-to-peak
value)

AGC output amplifier

V

connected to DACOUT − V

ref

ref

− V

black level voltage
AGC output amplifier output

at 10 kHz − 5 −Ω

impedance
AGC output static drive

static −−1mA

current
minimum gain of AGC circuit AGC DAC input code = 00

− 4.5 − dB

(9-bit control)

maximum gain of AGC circuit AGC DAC input code≥319

− 34.5 − dB

(9-bit control)

cut-off frequency AGC control DAC 4-bit

input code = 00 − 54 − MHz
input code = 01 − 40 − MHz
input code = 15 − 4 − MHz

1999 Sep 21 9