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CA3338D View Datasheet(PDF) - Intersil

Part NameDescriptionManufacturer
CA3338D CMOS Video Speed, 8-Bit, 50 MSPS, R2R D/A Converters Intersil
Intersil Intersil
CA3338D Datasheet PDF : 7 Pages
1 2 3 4 5 6 7
CA3338, CA3338A
+6V
CLOCK
8 DATA
BITS
15
1-7, 9
CA3338
LE
VOUT 12
D0 - D7
+5V
+ 4.7µF
TAN
0.1µF
CER.
16 VDD VREF+ 13
14
11
COMP VREF-
8
VSS
VEE 10
NOTES:
1.
BbyopthasVsReEdFw+ipthinina1n/d4
392
inch.
resistor
should
be
2. Keep nodal capacitance at CA3450 pin 3 as
low as possible.
3. VOUT Range = ±3V at CA3450.
4.7µF TAN
+
0.1µF
CER.
UP TO 5 OUTPUT LINES
FOR R = 75, 3 LINES
FOR R = 50
7, 8
5pF
R
+3.00V AT 25mA 14
9
+ 11
392
6
1%
3 CA3450
-
+ 1k
4, 5, 12, 13
VOUT = ±1.5VPEAK
VOUT1
R
10k
R
VOUTN
392
0.1µF CER.
R
1%
ADJUST
OFFSET
+
-6V
4.7µF
TAN
FIGURE 6. CA3338 AND CA3450 FOR DRIVING MULTIPLE COAXIAL LINES
TABLE 1. OUTPUT VOLTAGE vs INPUT CODE AND VREF Operating and Handling Considerations
VREF+
VREF -
STEP SIZE
5.12V 5.00V 4.608V 2.56V 2.50V
0
0
0
-2.56V -2.50V
0.0200V 0.0195V 0.0180V 0.0200V 0.0195V
Input Code
111111112 = FFHEX 5.1000V 4.9805V 4.5900V 2.5400V 2.4805V
111111102 = FE- 5.0800 4.9610 4.5720 2.5200 2.4610
HEX
HANDLING
All inputs and outputs of CMOS devices have a network
for electrostatic protection during handling. Recom-
mended handling practices for CMOS devices are
described in AN6525. “Guide to Better Handling and
Operation of CMOS Integrated Circuits.”
OPERATING
Operating Voltage
100000012 = 81HEX 2.5800
100000002 = 80HEX 2.5600
011111112 = 7FHEX 2.5400
2.5195
2.5000
2.4805
2.3220 0.0200 0.0195
2.3040 0.0000 0.0000
2.2860 - 0.0200 -0.0195
During operation near the maximum supply voltage limit,
care should be taken to avoid or suppress power supply
turn-on and turn-off transients, power supply ripple, or
ground noise; any of these conditions must not cause the
absolute maximum ratings to be exceeded.
Input Signals
000000012 = 01HEX 0.0200 0.0195 0.0180 -2.5400 -2.4805
000000002 = 00HEX 0.0000 0.0000 0.0000 -2.5600 -2.5000
Applications
To prevent damage to the input protection circuit, input
signals should never be greater than VDD nor less than
VSS. Input currents must not exceed 20mA even when
the power supply is off.
The output of the CA3338 can be resistively divided to match a
doubly terminated 50or 75line, although peak-to-peak
swings of less than 1V may result. The output magnitude will
also vary with the converter’s output impedance. Figure 5
shows such an application. Note that because of the HCT input
structure, the CA3338 could be operated up to +7.5V VDD and
VREF+ supplies and still accept 0V to 5V CMOS input voltages.
Unused Inputs
A connection must be provided at every input terminal. All
unused input terminals must be connected to either VCC
or GND, whichever is appropriate.
If larger voltage swings or better accuracy is desired, a high
speed output buffer, such as the HA-5033, HA-2542, or
CA3450, can be employed. Figure 6 shows a typical applica-
tion, with the output capable of driving ±2V into multiple 50
terminated lines.
10-17
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