Linear Technology LTC1668CG, 16-Bit, High Speed Differential Current Output DAC DC245A-A DC245A-A Fiche De Données
Codes de produits
DC245A-A
1
LTC1666/LTC1667/LTC1668
APPLICATIO S
U
FEATURES
DESCRIPTIO
U
TYPICAL APPLICATIO
N
U
12-Bit, 14-Bit, 16-Bit,
50Msps DACs
■
50Msps Update Rate
■
Pin Compatible 12-Bit, 14-Bit and 16-Bit Devices
■
High Spectral Purity: 87dB SFDR at 1MHz f
OUT
■
5pV-s Glitch Impulse
■
Differential Current Outputs
■
20ns Settling Time
■
Low Power: 180mW from
±
5V Supplies
■
TTL/CMOS (3.3V or 5V) Inputs
■
Small Package: 28-Pin SSOP
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.
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.
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.
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.
■
Cellular Base Stations
■
Multicarrier Base Stations
■
Wireless Communication
■
Direct Digital Synthesis (DDS)
■
xDSL Modems
■
Arbitrary Waveform Generation
■
Automated Test Equipment
■
Instrumentation
LTC1668, 16-Bit, 50Msps DAC
–
+
V
SS
V
DD
– 5V
CLOCK
INPUT
16-BIT DATA
INPUT
LADCOM
AGND DGND
CLK
DB15
DB0
1666/7/8 TA01
I
OUT A
0.1
µ
F
LTC1668
5V
52.3
Ω
I
REFIN
REFOUT
COMP1
COMP2
C2
0.1
µ
F
0.1
µ
F
C1
0.1
µ
F
R
SET
2k
I
OUT B
52.3
Ω
V
OUT
1V
P-P
DIFFERENTIAL
+
–
0.1
µ
F
16-BIT
HIGH SPEED
DAC
2.5V
REFERENCE
LTC1668 SFDR vs f
OUT
and f
CLOCK
f
OUT
(MHz)
0.1
SFDR (dB)
100
90
80
70
60
50
1.0
10
100
1666/7/8
G05
5MSPS
25MSPS
50MSPS
DIGITAL AMPLITUDE = 0dBFS