Voltage References

Symbol Pin
00-07 1-4,
21-24
DGnd 5
Conv 6
Conv 7
FT 8
VCC
9
FH 10
Blank 11
BRT 12
Sync 13
Ref- 14
Ref + 15
Comp 16
AGnd 17
Out- 18
Out + 19
VEE
20
MC10322
PIN FUNCTION DESCRIPTION
Description
Data inputs. DO is the LSB and 07 is the MSB. Inputs are TTL compatible. Maximum update
rate is typically 60 MHz. The eight bits control the Gray Scale amplitude only, and do not
involve the Sync or Blank levels.
Connect to system digital ground. This pin must be within 100 mV of AGnd (Pin 17).
Convert input. The rising edge latches data and controls if FT = O. May be used single-ended
(with Pin 7 at a fixed voltage), or differentially with Pin 7.
Convert input. The falling edge latches data and controls if FT = O. May be used
single-ended (with Pin 6 at a fixed voltage), or differentially with Pin 6.
Feedthrough. When high, the internal latches are transparent, and Pins 6 and 7 are unused.
When low, data and controls are latched by Pins 6 and 7.
Connect to + 5.0 V, ± 10%. This pin powers the digital portion of the IC.
Force High. A logic high internally sets data inputs = I, overriding external data inputs.
A logic high overrides data inputs, sets the outputs to the video blanking level.
Bright. A logic high increases the Gray Scale output level by = 11 %, providing an enhanced
display. Does not affect Sync or Blank.
A logic high overrides all other inputs, and sets the output to video sync level.
Inverting Reference input. A high impedance input, normally set to a negative DC voltage in
the range of - 0.8 to -1.7 V. Can be used to modulate the output.
Noninverting Reference input. A virtual ground, current supplied to this pin (between 0.5 and
1.7 mAl sets the maximum output current.
Compensation. A capacitor between this pin and Pin 20 stabilizes the reference amplifier.
Connect to system analog ground. This pin must be within 100 mVof DGnd (Pin 5).
A high impedance current output. Video voltage levels are produced when connected to a
75 Q cable with appropriate terminations. This output provides a "sync down" waveform. If
unused, connect to Pin 17.
Complementary output provides a "sync up" waveform. If unused, connect to Pin 17.
Connect to - 5.2 V, ± 10%. This supply should be referenced to analog ground.
Figure 1. Test Circuit
0.4V
or
2.4V
00
I
I
I
07
O.U.T.
Out-
Out +
Vout-
37.50
Vout+
37.50
FT
FH
BRT
BLK
Sync
MC10322
Re!-
Ref +
Comp
Vre!
_1.115mA
1.0k
Vee 0.01
OGnd
VEE
0.1
-5.2V
JlSl Conv AGnd
40MHz Ne Conv
MOTOROLA LINEAR/iNTERFACE les DEVICE DATA
6-64