NEC UPC667CT Datasheet
DATA SHEET
BIPOLAR ANALOG INTEGRATED CIRCUIT
µ
10-BIT D/A CONVERTER
The µPC667 is high-speed and high-precision 10-bit D/A converter.
Clock rate of the µPC667 is 60 Msps. Conversion precision of the µPC667 is ±1.0 LSB.
FEATURES
• Resolution 10-bit
• Clock rate 60 Msps
• Technology Bi-CMOS
• Power supply +5 V
• D/A conversion method R-2R ladder resistance and segment summing system
• Analog output form Voltage output type
• Built-in reference voltage generating circuit
PC667
ORDERING INFORMATION
Part Number Package
µ
PC667CT 30-pin plastic shrink DIP (400 mil)
The information in this document is subject to change without notice.
Document No. S11099EJ2V0DS00 (2nd edition)
(Previous No. IC-3250)
Date Published February 1996 P
Printed in Japan
The mark ★ shows major revised points.
©
1993, 1996
BLOCK DIAGRAM
CLK
D1 to D10 Input buffer
10
Master-slave
F.F.
Current switch R-2R ladder A
OUT
µ
PC667
Reference
voltage
generator
V
RSETVROUT
Amp.
V
REF
COMP AVCCDVCCAGND DGND
Reference
current source
Reference
resistor
2
PIN CONFIGURATION (Top View)
µ
PC667
D1
D2
D3
D4
D5
D6
D7
D8
D9
D10
DGND
CLK
NC
DGND
NC
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
µ
PC667CT
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
AGND : Ground for Analog Circuit
AOUT : Analog Output
AVCC : Power Supply for Analog Circuit
CLK : Clock
COMP : Phase Compensation
D1 to D10 : Digital Signal
DGND : Ground for Digital Circuit
CC : Power Supply for Digital Circuit
DV
NC : No Connection
REF : Reference Voltage
V
VROUT : Reference Voltage Output
VRSET : Reference Voltage Adjustment
DV
CC
AGND
CC
AV
COMP
OUT
A
V
REF
AV
CC
AGND
DGND
ROUT
V
V
RSET
NC
NC
NC
NC
3
PIN FUNCTIONS
DV
CC
500 Ω
DGND
DGND
DV
CC
DV
CC
500 Ω
DGND
DGND
DV
CC
DVCC
DGND
µ
PC667
Pin Name Pin No.
D1 to D10
1 to 10 Input Digital signal
Input/
Output
D1 is MSB, D10 is LSB.
CLK 12 Input Clock
The rising edge of signal input to
this pin triggers analog output.
Function Equivalent Circuit
DVCC 30 — Power supply for digital circuit
DGND 11, 14, 22 — Ground for digital circuit
VRSET 20 — Reference voltage adjustment
Voltage adjusting pin for the
AV
CC
AV
CC
incorporated reference voltage
generating circuit. The output
7.5 kΩ
AV
CC
voltage of VROUT pin varies according
to the voltage applied to this pin.
When no adjustment is necessary,
connect approx. 0.1 µF capacitance
between this pin and GND pin.
VROUT 21 Output Reference voltage output
Voltage output pin of the incorporated reference voltage generating
V
ROUT
Reference
voltage
generator
AGND
3 kΩ
2 kΩ
RSET
V
AGND
circuit. This pin has high output
impedance, and must be connected
with a high impedance element.
4
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