Data Sheet
CDK3405
FEATURES
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8-bit, 180MSPS, Triple Video DACs
CDK3405
8-bit, 180MSPS, Triple Video DACs
General Description
CDK3405 is a low-cost triple D/A converter that is tailored to fit graphics and
video applications where speed is critical.
CMOS-level inputs are converted to analog current outputs that can drive
25-37.5Ω loads corresponding to doubly-terminated 50-75Ω loads. A sync
current following SYNC input timing is added to the IO
G
output. BLANK
will override RGB inputs, setting IO
G
, IO
B
and IO
R
currents to zero when
BLANK = L. Although appropriate for many applications, the internal 1.25V
reference voltage can be overridden by the V
REF
input.
Few external components are required, just the current reference resistor,
current output load resistors, bypass capacitors, and decoupling capacitors.
Package is a 48-lead TQFP. Fabrication technology is CMOS. Performance is
guaranteed from -40°C to +125°C.
8-bit resolution, 180MSPS
±2.5% gain matching
±0.5% linearity error
Sync and blank controls
1.0V
pp
video into 37.5Ω or 75Ω load
Internal bandgap voltage reference
Low glitch energy
Single +3.3V power supply
APPLICATIONS
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Video signal conversion
– RGB
– YC
B
C
R
– Composite, Y, C
Multimedia systems
Image processing
PC Graphics
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Block Diagram
SYNC
BLANK
SYNC
Rev 1B
G7-0
8
8-bit D/A
Converter
IO
G
B7-0
8
8-bit D/A
Converter
IO
B
R7-0
CLOCK
8
8-bit D/A
Converter
IO
R
COMP
R
REF
V
REF
+1.25V
Ref
Ordering Information
Part Number
CDK3405ATQ48
CDK3405ATQ48Y
Package
TQFP-48
TQFP-48
Pb-Free
Yes
Yes
RoHS Compliant
Yes
Yes
Operating Temp Range
-40°C to +125°C
-40°C to +125°C
Packaging Method Package Quantity
Tray
Tray
250
1,250
Moisture sensitivity level for all parts is MSL-3.
©2009-2010 CADEKA Microcircuits LLC
www.cadeka.com
Data Sheet
Pin Configuration
TQFP-48
R7
R6
R5
R4
R3
R2
R1
R0
GND
GND
NC
R
SET
CDK3405
8-bit, 180MSPS, Triple Video DACs
48
47
46
45
44
43
42
41
40
39
38
37
GND
GND
G0
G1
G2
G3
G4
G5
G6
G7
BLANK
SYNC
1
2
3
4
5
6
7
8
9
10
11
12
36
35
34
33
32
31
30
29
28
27
26
25
TQFP
CDK3405
V
REF
COMP
IO
R
NC
IO
G
NC
V
AA
V
AA
IO
B
NC
GND
GND
Pin Assignments
Pin No.
24
41-48
3-10
16-23
Controls
12
11
Video Outputs
34
32
28
36
37
35
13, 29, 30
1, 2, 14,
15, 25, 26,
39, 40
27, 31, 33
IOR
IOG
IOB
V
REF
R
SET
COMP
V
AA
GND
NC
Red Current Output
Green Current Output
Blue Current Output
Input for DACs or Voltage Reference Output (1.25V)
Current-Setting Resistor
Compensation Capacitor
Analog Power Supply
Ground
No Connect
SYNC
BLANK
Sync Pulse Input
Blanking Input
Pin Name
CLK
R7-0
G7-0
B7-0
Description
Clock Input
Red Pixel Data Inputs
Green Pixel Data Inputs
Blue Pixel Data Inputs
Clock and Pixel I/O
V
AA
GND
GND
B0
B1
B2
B3
B4
B5
B6
B7
CLOCK
13
14
15
16
17
18
19
20
21
22
23
24
Rev 1B
Voltage Reference
Power and Ground
©2009-2010 CADEKA Microcircuits LLC
www.cadeka.com
2
Data Sheet
Absolute Maximum Ratings
The safety of the device is not guaranteed when it is operated above the “Absolute Maximum Ratings”. The device
should not be operated at these “absolute” limits. Adhere to the “Recommended Operating Conditions” for proper
device function. The information contained in the Electrical Characteristics tables and Typical Performance plots reflect
the operating conditions noted on the tables and plots.
CDK3405
8-bit, 180MSPS, Triple Video DACs
Parameter
Power Supply Voltage
V
AA
(Measured to GND)
Digital Inputs
Applied Voltage (measured to GND)
(2)
Forced Current
(3,4)
Analog Inputs
Applied Voltage (measured to GND)
(2)
Forced Current
(3,4)
Analog Outputs
Applied Voltage (measured to GND)
(2)
Forced Current
(3,4)
Short Circuit Duration (single output in HIGH state to GND)
Min
-0.5
-0.5
-5.0
-0.5
-10.0
-0.5
-60.0
Max
4.0
V
AA
+ 0.5
5.0
V
AA
+ 0.5
10.0
V
AA
+ 0.5
60.0
unlimited
Unit
V
V
mA
V
mA
V
mA
sec
Reliability Information
Parameter
Temperature
Operating, Ambient
Junction
Lead Soldering (10 seconds)
Vapor Phase Soldering (1 minute)
Storage
Package Thermal Resistance (
θ
JA
)
Notes:
1. Functional operation under any of these conditions is NOT implied.
Performance and reliability are guaranteed only if Operating Conditions are not exceeded.
2. Applied voltage must be current limited to specified range.
3. Forcing voltage must be limited to specified range.
4. Current is specified as conventional current flowing into the device.
Min
-40
Max
125
150
300
220
150
65
Unit
°C
°C
°C
°C
°C
°C/W
Rev 1B
-65
CDK3405 Power Derating
Maximum Power Dissipation (W)
3
2.5
2
TQFP-48
ESD Protection
Parameter
Human Body Model (HBM)
Charged Device Model (CDM)
TQFP-48
TBD
TBD
1.5
1
0.5
0
-40
-20
0
20
40
60
80 100 120
Ambient Temperature (°C)
Recommended Operating Conditions
Symbol
V
AA
V
REF
C
C
R
L
T
A
Parameter
Power Supply Voltage
Reference Voltage, External
Compensation Capacitor
Output Load
Ambient Temperature, Still Air
Min
3.0
1.0
Typ
3.3
1.25
0.1
37.5
Max
3.6
1.5
Unit
V
V
µF
Ω
°C
3
-40
+125
©2009-2010 CADEKA Microcircuits LLC
www.cadeka.com
Data Sheet
Electrical Characteristics
(T
A
= 25°C, V
AA
=3.3V, V
REF
= 1.25V, R
L
= 37.5Ω, unless otherwise noted)
Symbol
I
DD
PD
Parameter
Power Supply Current
Total Power Dissipation
(2)
Input Voltage, HIGH
(1)
Input Voltage, LOW
(1)
Input Current, HIGH
Input Capacitance
Output Current
(1)
(1)
Conditions
T
A
= 25°C
(1)
T
A
= -40°C to +125°C
T
A
= -40°C to +125°C
T
A
= -40°C to +125°C
T
A
= -40°C to +125°C
T
A
= -40°C to +125°C
T
A
= -40°C to +125°C
(2)
Min
Typ
80
Max
85
95
300
Units
mA
mA
CDK3405
8-bit, 180MSPS, Triple Video DACs
mW
V
Digital Inputs
V
IH
V
IL
I
IH
I
IL
C
I
2.5
0.8
-1
-1
4
30
40
7
T
A
= -40°C to +125°C
1.135
1.25
1.365
1
1
V
μA
μA
pF
mA
kΩ
pF
V
Input Current, LOW
(1)
Analog Outputs
R
O
C
O
V
REF
Output Resistance
Output Capacitance
Reference Voltage Output
(1)
Reference Output
Notes:
1. 100% tested at 25°C.
2. Parameter is guaranteed (but not tested) by design and characterization data.
Switching Characteristics
(T
A
= 25°C, V
AA
=3.3V, V
REF
= 1.25V, R
L
= 37.5Ω, unless otherwise noted)
Symbol
Clock Input
Conversion Rate
(1)
t
PWH
t
PWL
Pulse-width HIGH
(2)
Pulse-width LOW
(2)
T
A
= -40°C to +125°C
T
A
= -40°C to +125°C
T
A
= -40°C to +125°C
T
A
= 25°C
(1)
T
A
= -40°C to +125°C
(2)
T
A
= 25°C
(1)
Parameter
Conditions
Min
Typ
Max
180
Units
MSPS
ns
ns
ns
ns
Rev 1B
2
2
1.5
2
0.6
0.6
1.6
0.6
0.4
2.5
0.3
Data Inputs
t
S
t
H
Setup
Hold
ns
ns
ns
ns
ns
ns
ns
T
A
= -40°C to +125°C
(2)
T
A
= -40°C to +125°C
T
A
= -40°C to +125°C
T
A
= -40°C to +125°C
Data Outputs, with 50Ω doubly terminated load
t
D
t
R
t
F
t
SET
t
SKEW
Notes:
1. 100% production tested at +25°C.
2. Parameter is guaranteed (but not tested) by design and characterization data.
Clock to Output Delay
Output Risetime
Output Falltime
Settling Time
Output Skew
©2009-2010 CADEKA Microcircuits LLC
www.cadeka.com
4
Data Sheet
DC Performance
(T
A
= 25°C, V
AA
=3.3V, V
REF
= 1.25V, R
L
= 37.5Ω, unless otherwise noted)
Symbol
Parameter
Resolution
INL
DNL
Integral Linearity Error
Differential Linearity Error
Offset Error
Gain Matching Error
Absolute Gain Error
T
A
= 25°C
(1)
T
A
= -40°C to +125°C
(2)
T
A
= 25°C
(1)
T
A
= -40°C to +125°C
(2)
T
A
= -40°C to +125°C
(2)
Conditions
Min
8
-0.5
-0.5
-0.5
-0.5
-2.5
-3.5
18.0
18.0
Typ
Max
0.5
0.5
0.5
0.5
0.01
2.5
3.5
Units
bits
LSB
LSB
LSB
LSB
%FS
%FS
%FS
mA
mA
mA
CDK3405
8-bit, 180MSPS, Triple Video DACs
T
A
= -40°C to +125°C
(1)
T
A
= -40°C to +125°C
(1)
T
A
= 25°C
(1)
18.7
18.7
18.7
19.4
19.4
Full-Scale Output Current
T
A
= -40°C to +125°C
(2)
T
A
= -40°C to +125°C , With internal
reference. Trim RSET to calibrate full-scale
current.
T
A
= -40°C to +125°C
(2)
PSRR
Notes:
Power Supply Rejection Ratio
-0.01
0
0.01
%/%
1. 100% production tested at +25°C.
2. Parameter is guaranteed (but not tested) by design and characterization data.
AC Performance
(T
A
= 25°C, V
AA
= 3.3V, V
REF
= 1.25V, R
L
= 37.5Ω, unless otherwise noted)
Symbol
Parameter
Glitch Energy
DAC-to-DAC Crosstalk
Data Feedthrough
Clock Feedthrough
Notes:
1. 100% production tested at +25°C.
2. Parameter is guaranteed (but not tested) by design and characterization data.
Conditions
Min
Typ
20
30
50
60
Max
Units
pVsec
dB
dB
dB
Analog Outputs
Rev 1B
©2009-2010 CADEKA Microcircuits LLC
www.cadeka.com
5
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