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A/D and D/A Converters
AN8140K
High-speed Low Power Consumption 10-bit D/A Converter
s Overview
The AN8140K is a 10-bit D/A converter for image processing which has realized low power comsumption by using the Bi-CMOS process.
21.70.3 Unit : mm
s Features
* 10-bit resolution * High speed : maximum conversion rate of 50MSPS * Low power comsumption : 150mW * TTL compatible input level * Single 5V power supply * Built-in reference power supply
1 2 3 4 5 6 7 8 9 10 11 12 6.20.3
24 23 22 21 20 19 18 17 16 15 14 13
1.778
1.10.25
4.70.25
s Application Field
* Image equipment such as hi-vision device * OA equipment such as image scanner * Measuring equipment such as digital oscilloscope
3 15 7.620.25
0.3
+ 0.2 - 0.05
24-pin Shrunk DIL Plastic Package (SDIP024-P-0300)
s Block Diagram
COMP
9
CLK
14
D5
19
D4
20
D3
21
D2
22
D1
23
(LSB) D0
24
REFI IREF
7 10
-
X - Decoder Current Source Latch Latch
D6 D7 D8 D9 (MSB)
18 1/2 17 X- Decoder Latch 16 15 Reference Voltage Regulator 6 1/4 1/8
0.50.1 0.90.25 3.050.25 5
+
OUT
REFO
3
13
2
11
12
4
8
1
AGND DVCC DGND AVCC AVCC AGND
VIB
NC
1
AN8140K
s Main Characteristics (VCC=5.0V, Ta=25C)
Parameter Resolution Linearity error Differential linearity error Maximum conversion rate RREF = 470 RO = 75 VREFO -VREFI = 1.4V Condition
A/D and D/A Converters
Rating 10 1.0 1.0 50
Unit bit LSB LSB MSPS
s Absolute Maximum Rating (Ta=25C)
Paremeter Supply voltage Digital input voltage Analogue output current Reference input voltage Power dissipation Operating ambient temperature Storage temperature Symbol VCC VIN IO VREFI PD Topr Tstg Rating - 0.3 to +7.0 - 0.3 to DVCC 30 - 0.3 to AVCC 700 -20 to + 70 -55 to +150 Unit V V mA V mW C C
s Electrical Characteristics (VCC=5.0V, Ta=25C)
Parameter Supply current Digital input leak current REFI input leak current Reference output voltage Linearty error Differential linearty error Maximum conversion rate Full-scale output voltage Zero-scale output voltage Settling time Symbol ICC ILK1 ILK2 VREFO EL ED FC VFS VZS tST RREF= 470 RO= 75 VREF0 -VREFI= 1.4V 50 4.9 3.8 5.0 4.0 5.1 4.2 20 VIN= 0V, 5V VIN= 0V, 5V IREFO= 3.0mA 2.16 2.7 0.5 0.5 Rating min typ 30 max 50 30 30 3.24 1 1 Unit mA A A V LSB LSB MSPS V V ns
s Recommended Operating Conditions (Ta=25C)
Parameter Supply voltage Regerence voltage vREFO = 2.7V Output load resistance Digital input voltage Clock input pulse width Setting-up time Holding time *1 : Refer to the timing chart. *2 : tWH+tWL20ns Symbol VCC VREFI RO VIH VIL tWH tWL tS tH *1 *1 *1 *1 8 *2 8 *2 5 1 2.4 0.8 RO = 75, RREF = 470 Conditions min 4.75 typ 5.0 1.3 75 max 5.25 Unit V V V V ns ns ns ns
2
A/D and D/A Converters
s Pin Descriptions
Pin No. Symbol 1 2 3 4 5 6 7 8 9 10 11 12 NC DGND AGND AGND OUT REFO REFI VIB COMP IREF AVCC AVCC Digital GND Analogue GND Analogue GND Analogue output Reference voltage output Reference voltage input Stabilized capacitive pin Compensation capacitive pin Reference current pin Analogue power supply Analogue power supply Pin name No connection pin Pin No. Symbol 13 14 15 16 17 18 19 20 21 22 23 24 DVCC CLK D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 Clock input Digital input 1-bit (MSB) Digital input 2-bit Digital input 3-bit Digital input 4-bit Digital input 5-bit Digital input 6-bit Digital input 7-bit Digital input 8-bit Digital input 9-bit Digital input 10-bit (LSB) Pin name Digital power supply
AN8140K
s Timing Chart
tWH tWL
CLK
tS
tH
DATA
Dn - 1
Dn
Dn+1
tST
OUT
An - 2
An - 1
An
3
AN8140K
s Output Code
Digital input Step 0123456789 000 001 * * * 511 512 513 * * * 1022 1023 0000000000 0000000001 * * * 0111111111 1000000000 1000000001 * * * 1111111110 1111111111
A/D and D/A Converters
Output voltage VOUT 4.0000 4.0010 * * * 4.4995 4.5005 4.5015 * * * 4.9990 5.0000
s Application Circuit
DIGITAL IN
(LSB) NC DGND AGND Video Signal OUT LOW PASS FILTER 10k REFI + 1F RREF IREF 470 AVCC + AVCC DVCC AGND DGND AVCC CLK CLK DVCC + D9 5k + VIB COMP D6 D7 D8 (MSB) Ro 75 AGND OUT REFO D0 D1 D2 D3 D4 D5
4

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