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Linear Technology Electronic Components Datasheet

LTC1666 Datasheet

(LTC1666 - LTC1668) 50Msps DACs

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LTC1666 pdf
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FEATURES
s 50Msps Update Rate
s Pin Compatible 12-Bit, 14-Bit and 16-Bit Devices
s High Spectral Purity: 87dB SFDR at 1MHz fOUT
s 5pV-s Glitch Impulse
s Differential Current Outputs
s 20ns Settling Time
s Low Power: 180mW from ±5V Supplies
s TTL/CMOS (3.3V or 5V) Inputs
s Small Package: 28-Pin SSOP
U
APPLICATIO S
s Cellular Base Stations
s Multicarrier Base Stations
s Wireless Communication
s Direct Digital Synthesis (DDS)
s xDSL Modems
s Arbitrary Waveform Generation
s Automated Test Equipment
s Instrumentation
LTC1666/LTC1667/LTC1668
12-Bit, 14-Bit, 16-Bit,
50Msps DACs
DESCRIPTIO
The LTC®1666/LTC1667/LTC1668 are 12-/14-/16-bit,
50Msps differential current output DACs implemented on
a high performance BiCMOS process with laser trimmed,
thin-film resistors. The combination of a novel current-
steering architecture and a high performance process
produces DACs with exceptional AC and DC performance.
The LTC1668 is the first 16-bit DAC in the marketplace to
exhibit an SFDR (spurious free dynamic range) of 87dB
for an output signal frequency of 1MHz.
Operating from ±5V supplies, the LTC1666/LTC1667/
LTC1668 can be configured to provide full-scale output
currents up to 10mA. The differential current outputs of
the DACs allow single-ended or true differential operation.
The –1V to 1V output compliance of the LTC1666/
LTC1667/LTC1668 allows the outputs to be connected
directly to external resistors to produce a differential out-
put voltage without degrading the converter’s linearity. Al-
ternatively, the outputs can be connected to the summing
junction of a high speed operational amplifier, or to a
transformer.
The LTC1666/LTC1667/LTC1668 are pin compatible and
are available in a 28-pin SSOP and are fully specified over
the industrial temperature range.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATION
LTC1668, 16-Bit, 50Msps DAC
5V
0.1µF
0.1µF
RSET
2k
C1
0.1µF
C2
0.1µF
REFOUT
IREFIN
2.5V
REFERENCE
VDD
LTC1668
COMP1
COMP2
VSS
+ 16-BIT
HIGH SPEED
DAC
AGND DGND CLK DB15 DB0
0.1µF
– 5V
CLOCK 16-BIT DATA
INPUT INPUT
IOUT A
IOUT B
LADCOM
1666/7/8 TA01
52.3
52.3
+
VOUT
1VP-P
DIFFERENTIAL
DataSheet4 U .com
LTC1668 SFDR vs fOUT and fCLOCK
100
5MSPS
90
25MSPS
80 50MSPS
70
60
50
0.1
DIGITAL AMPLITUDE = 0dBFS
1.0 10
fOUT (MHz)
100
1666/7/8 G05
1


Linear Technology Electronic Components Datasheet

LTC1666 Datasheet

(LTC1666 - LTC1668) 50Msps DACs

No Preview Available !

LTC1666 pdf
www.DataSheet4U.com
LTC1666/LTC1667/LTC1668
ABSOLUTE AXI U RATI GS (Note 1)
Supply Voltage (VDD) ................................................ 6V
Negative Supply Voltage (VSS) ............................... – 6V
Total Supply Voltage (VDD to VSS) .......................... 12V
Digital Input Voltage .................... – 0.3V to (VDD + 0.3V)
Analog Output Voltage
(IOUT A and IOUT B) ........ (VSS – 0.3V) to (VDD + 0.3V)
Power Dissipation ............................................. 500mW
Operating Temperature Range
LTC1666C/LTC1667C/LTC1668C ........... 0°C to 70°C
LTC1666I/LTC1667I/LTC1668I .......... – 40°C to 85°C
Storage Temperature Range ................ – 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
UW U
PACKAGE/ORDER I FOR ATIO
TOP VIEW
DB9 1
DB8 2
DB7 3
DB6 4
DB5 5
DB4 6
DB3 7
DB2 8
DB1 9
DB0 (LSB) 10
NC 11
NC 12
NC 13
NC 14
28 DB10
27 DB11 (MSB)
26 CLK
25 VDD
24 DGND
23 VSS
22 COMP2
21 COMP1
20 IOUT A
19 IOUT B
18 LADCOM
17 AGND
16 IREFIN
15 REFOUT
DB11 1
DB10 2
DB9 3
DB8 4
DB7 5
DB6 6
DB5 7
DB4 8
DB3 9
DB2 10
DB1 11
DB0 (LSB) 12
NC 13
NC 14
TOP VIEW
28 DB12
27 DB13 (MSB)
26 CLK
25 VDD
24 DGND
23 VSS
22 COMP2
21 COMP1
20 IOUT A
19 IOUT B
18 LADCOM
17 AGND
16 IREFIN
15 REFOUT
G PACKAGE
28-LEAD PLASTIC SSOP
TJMAX = 110°C, θJA = 100°C/W
ORDER PART
NUMBER
LTC1667CG
LTC1667IG
DB13 1
DB12 2
DB11 3
DB10 4
DB9 5
DB8 6
DB7 7
DB6 8
DB5 9
DB4 10
DB3 11
DB2 12
DB1 13
DB0 (LSB) 14
TOP VIEW
28 DB14
27 DB15 (MSB)
26 CLK
25 VDD
24 DGND
23 VSS
22 COMP2
21 COMP1
20 IOUT A
19 IOUT B
18 LADCOM
17 AGND
16 IREFIN
15 REFOUT
G PACKAGE
28-LEAD PLASTIC SSOP
TJMAX = 110°C, θJA = 100°C/W
Consult LTC Marketing for parts specified with wider operating temperature ranges.
G PACKAGE
28-LEAD PLASTIC SSOP
TJMAX = 110°C, θJA = 100°C/W
ORDER PART
NUMBER
LTC1666CG
LTC1666IG
ORDER PART
NUMBER
LTC1668CG
LTC1668IG
2
DataSheet4 U .com


Part Number LTC1666
Description (LTC1666 - LTC1668) 50Msps DACs
Maker Linear Technology
Total Page 24 Pages
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LTC1666 pdf
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