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A/D, D/C Converters for Image Signal Processing
MN6557A, MN6557AS
Low-Power-Consumption CMOS 10-Bit D/A Converters for Image Processing
Overview
The MN6557A and MN6557AS are CMOS 10-bit D/A
converters with a maximum conversion rate of 30 MSPS.
High precision has been achieved by the combined use
of a matrix cell system and weighted current system. They
also feature low power consumption owing to the use of
a CMOS process, and operate on a single power supply
of 5V, and have a TTL input level.
These devices are suitable for digitalization of image
processing in video, TV, and similar applications.
Features
Maximum conversion rate: 30 MSPS (min.)
Linearity error: ±0.5 LSB (typ.)
Differential linearity error: ±0.3 LSB (typ.)
Power supply voltage: 5.0 ±0.5 V
Power consumption: 125 mW (typ.)
Full-scale current: 13 mA (typ.)
Applications
Digital TV
Digital video
Digital signal processing equipment
Pin Assignment
MN6557A DIP022-P-0400
MN6557AS SOP022-P-0375
DV
AV
AV
I
REF
V
REF
COMP
VIB
I
OUT
AV
AV
DV
DD
DD
DD
1
2
3
4
5
6
7
8
9
SS
10
SS
11
SS
( TOP VIEW )
CLK
22
D1
21
D2
20
D3
19
D4
18
D5
17
D6
16
D7
15
D8
14
D9
13
D10
12
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MN6557A, MN6557AS A/D, D/C Converters for Image Signal Processing
Block Diagram
R
REF
(LSB) D10
(MSB)D1
+
–
COMP
V
D9
D8
D7
D6
D5
D4
D3
D2
CLK
REF
I
REF
12
13
14
15
16
17
18
19
20
21
22
X-Decoder
Latch
Latch
Matrix Cell
(127=8 × 16–1)
Latch
1/2 1/4 1/8
R
I
8
OUT
OUT
Y-Decoder
6
5
+
4
–
Current
Source
7
VIB
2
3
DDAVDDDVDD
AV
1
9
10
AVSSAV
11
SS
SS
DV
2
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A/D, D/C Converters for Image Signal Processing MN6557A, MN6557AS
Pin Descriptions
Pin No. Symbol Function Description
1DVDDPower supply for digital section
2AVDDPower supply for analog section
3AVDDPower supply for analog section
4I
5V
REF
REF
6 COMP Phase compensation
7 VIB Capacitor connection
8I
OUT
9AVSSAnalog GND
10 AV
11 DV
SS
SS
12 D10 Digital input (LSB)
13 D9 Digital input
14 D8 Digital input
15 D7 Digital input
16 D6 Digital input
17 D5 Digital input
18 D4 Digital input
19 D3 Digital input
20 D2 Digital input
21 D1 Digital input (MSB)
22 CLK Sampling clock
Full-scale adjustment resistor
Reference voltage input
Analog current output
Analog GND
Digital GND
Absolute Maximum Ratings Ta=25˚C
Parameter Symbol Rating Unit
Digital-section power supply voltage DV
Analog-section power supply voltage AV
Input voltage V
Output voltage V
Operating ambient temperature T
Storage temperature T
opr
stg
O
DD
DD
I
– 0.3 to +7.0 V
– 0.3 to +7.0 V
DVSS – 0.3 to DV
AVSS – 0.3 to AV
+ 0.3 V
DD
+ 0.3 V
DD
–20 to +70 ˚C
–55 to +125 ˚C
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MN6557A, MN6557AS A/D, D/C Converters for Image Signal Processing
Recommended Operating Conditions V
=AVDD=DVDD=5.0V, VSS=A VSS=DVSS=0V, Ta=25˚C
DD
Parameter Symbol min typ max Unit
Power supply voltage V
Reference voltage V
Reference resistance R
External compensating capacitance C
Output load resistance R
Digital input voltage "H" level V
"L" level V
Clock "H" pulse width t
"L" pulse width t
Electrical Characteristics DV
=AVDD=5.0V, DGND=AGND=0V, Ta=25˚C
DD
DD
REF
REF
COMP
OUT
IH
IL
WH
WL
4.5 5.0 5.5 V
2.95 V
680 Ω
1 µF
75 Ω
2.4 V
V
SS
DD
0.8 V
13 ns
13 ns
Parameter Symbol Condition min typ max Unit
Power supply current I
DD
R
REF
=680Ω, V
=2.95V 25 50 mA
REF
Resolution RES 10 bit
Linearity error E
Differential linearity error E
Full-scale current I
Hold time t
Setup time t
Settling time t
Maximum conversion rate F
C(max.)
L
D
FS
H
S
ST
R
=75Ω, R
OUT
V
=2.95V ±0.3 ±1.0 LSB
REF
R
=680Ω, V
REF
=680Ω±0.5 ±1.0 L SB
REF
=2.95V 13 mA
REF
10 ns
10 ns
R
=75Ω, R
OUT
V
=2.95V 30 50 MSPS
REF
=680Ω 20 33 ns
REF
V
4
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A/D, D/C Converters for Image Signal Processing MN6557A, MN6557AS
Timing Chart
CLK
Data
Analog Out
(settling waveform)
t
WH
t
S
t
WL
t
H
Dn-1 Dn Dn+1
±1LSB
An
t
dtST
tdt
2.4V
0.8V
±1LSB
ST
5
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MN6557A, MN6557AS A/D, D/C Converters for Image Signal Processing
Package Dimensions (Unit: mm)
MN6557A DIP022-P-0400
27.7±0.4
22
12
8.6±0.2
1
2.54
0.5±0.1
MN6557AS SOP022-P-0375
22
111
15.30
1.2±0.1
±0.20
11
3.65±0.20
5.3max.
0.7min.
3.3±0.3
0 to 15°
10.16±0.20
0.25
+0.20
0.05
-
SEATING PLANE
12
1.10
±0.20
±0.20
±0.30
0.05
-
7.20
+0.10
0.15
0 to 10°
0.30min.
±0.20
2.00
2.40max. 9.40
(1.29) 0.40
1.27
SEATING PLANE
±0.10
±0.10
0.10
6
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