LTC1666CG Linear Technology, LTC1666CG Datasheet

IC D/A CONV 12BIT 50MSPS 28-SSOP

LTC1666CG

Manufacturer Part Number
LTC1666CG
Description
IC D/A CONV 12BIT 50MSPS 28-SSOP
Manufacturer
Linear Technology
Datasheet

Specifications of LTC1666CG

Settling Time
20ns
Number Of Bits
12
Data Interface
Parallel
Number Of Converters
1
Voltage Supply Source
Dual ±
Power Dissipation (max)
180mW
Operating Temperature
0°C ~ 70°C
Mounting Type
Surface Mount
Package / Case
28-SSOP
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
LTC1666CG
Manufacturer:
LT
Quantity:
24
Part Number:
LTC1666CG
Manufacturer:
LINEAR/凌特
Quantity:
20 000
FEATURES
APPLICATIO S
TYPICAL
0.1 F
0.1 F
50Msps Update Rate
Pin Compatible 12-Bit, 14-Bit and 16-Bit Devices
High Spectral Purity: 87dB SFDR at 1MHz f
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
Cellular Base Stations
Multicarrier Base Stations
Wireless Communication
Direct Digital Synthesis (DDS)
xDSL Modems
Arbitrary Waveform Generation
Automated Test Equipment
Instrumentation
C1
0.1 F
R
C2
SET
2k
APPLICATION
REFOUT
I
COMP1
COMP2
REFIN
– 5V
V
SS
U
REFERENCE
0.1 F
2.5V
+
AGND DGND
LTC1668, 16-Bit, 50Msps DAC
U
V
5V
CLK
DD
CLOCK
INPUT
DB15
0.1 F
HIGH SPEED
16-BIT DATA
16-BIT
DAC
INPUT
DB0
OUT
LTC1668
LADCOM
I
I
1666/7/8 TA01
OUT A
OUT B
DESCRIPTIO
The LTC
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.
52.3
52.3
, LTC and LT are registered trademarks of Linear Technology Corporation.
LTC1666/LTC1667/LTC1668
V
OUT
®
+
1666/LTC1667/LTC1668 are 12-/14-/16-bit,
1V
DIFFERENTIAL
P-P
12-Bit, 14-Bit, 16-Bit,
U
100
90
80
70
60
50
LTC1668 SFDR vs f
50Msps DACs
0.1
5MSPS
1.0
50MSPS
DIGITAL AMPLITUDE = 0dBFS
f
OUT
(MHz)
25MSPS
OUT
10
and f
1666/7/8 G05
CLOCK
1
100

Related parts for LTC1666CG

LTC1666CG Summary of contents

Page 1

... 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. 5V 0.1 F LTC1668 DD 52.3 ...

Page 2

... DB11 LTC1667IG 4 DB10 5 DB9 6 DB8 7 DB7 8 DB6 9 DB5 10 DB4 11 DB3 12 DB2 13 DB1 14 DB0 (LSB) 28-LEAD PLASTIC SSOP T = 110 C, JMAX ORDER PART NUMBER LTC1666CG LTC1666IG ORDER PART TOP VIEW NUMBER 28 DB14 27 DB15 (MSB) LTC1668CG 26 CLK LTC1668IG DGND COMP2 21 COMP1 20 I OUT OUT B ...

Page 3

ELECTRICAL CHARACTERISTICS temperature range, otherwise specifications are at T SYMBOL PARAMETER CONDITIONS DC Accuracy (Measured Driving a Virtual Ground) OUT A Resolution Monotonicity INL Integral Nonlinearity (Note 2) DNL Differential Nonlinearity (Note 2) Offset Error Offset Error ...

Page 4

LTC1666/LTC1667/LTC1668 ELECTRICAL CHARACTERISTICS temperature range, otherwise specifications are at T SYMBOL PARAMETER Analog Output I Full-Scale Output Current OUTFS Output Compliance Range Output Resistance IOUT A IOUT B Output Capacitance Reference Output Reference Voltage Reference Output Drift ...

Page 5

W U TYPICAL PERFOR A CE CHARACTERISTICS Single Tone SFDR at 50MSPS 0 SFDR = 87dB – 50MSPS CLOCK f = 1.002MHz –20 OUT AMPL = 0dBFS –30 = –8.25dBm –40 –50 –60 –70 –80 –90 –100 10 ...

Page 6

LTC1666/LTC1667/LTC1668 W U TYPICAL PERFOR A CE CHARACTERISTICS SFDR vs Digital Amplitude (dBFS) and /11 CLOCK OUT CLOCK 100 95 455kHz AT 5MSPS 4.55MHz AT 50MSPS 75 2.277MHz AT 25MSPS 70 65 ...

Page 7

W U TYPICAL PERFOR A CE CHARACTERISTICS CTIO S LTC1666 REFOUT (Pin 15): Internal Reference Voltage Output. Nominal value is 2.5V. Requires a 0.1 F bypass capacitor to AGND. I (Pin 16): Reference Input Current. ...

Page 8

LTC1666/LTC1667/LTC1668 CTIO S LTC1667 REFOUT (Pin 15): Internal Reference Voltage Output. Nominal value is 2.5V. Requires a 0.1 F bypass capacitor to AGND. I (Pin 16): Reference Input Current. Nominal value is REFIN 1.25mA for ...

Page 9

W BLOCK DIAGRA V 15 REFOUT REF 0 SET REFIN + – 21 COMP1 22 COMP2 0 0.1 F – REFOUT REF 0 SET 2k ...

Page 10

LTC1666/LTC1667/LTC1668 W BLOCK DIAGRA V 15 REFOUT REF REFERENCE 0 SET REFIN + – 21 COMP1 22 COMP2 0 0.1 F – DIAGRA ...

Page 11

U U APPLICATIO S I FOR ATIO Theory of Operation The LTC1666/LTC1667/LTC1668 are high speed current steering 12-/14-/16-bit DACs made on an advanced BiCMOS process. Precision thin film resistors and well matched bipolar transistors result in excellent DC linearity and ...

Page 12

LTC1666/LTC1667/LTC1668 U U APPLICATIO S I FOR ATIO Adjusting the Full-Scale Output In Figure 2, a serial interfaced DAC is used to set I The LTC1661 is a dual 10-bit V OUT voltage output that swings from ...

Page 13

U U APPLICATIO S I FOR ATIO LTC1666/LTC1667/LTC1668 R R IOUT B IOUT A 1.1k 1.1k 5pF Figure 3. Equivalent Analog Output Circuit LADCOM The LADCOM pin is the common connection for the internal DAC attenuator ladder. It usually is ...

Page 14

LTC1666/LTC1667/LTC1668 U U APPLICATIO S I FOR ATIO Operating with Reduced Output Currents The LTC1666/LTC1667/LTC1668 are specified to operate with full-scale output current, I OUTFS 10mA down to 1mA. This can be useful to reduce power dissipation or to adjust ...

Page 15

U U APPLICATIO S I FOR ATIO Resistor Loaded Outputs A differential resistor loaded output configuration is shown in Figure simple and economical, but it can drive only differential loads with impedance levels and ampli- tudes appropriate ...

Page 16

LTC1666/LTC1667/LTC1668 U U APPLICATIO S I FOR ATIO cluding the output signal band of interest. Therefore, any direct coupling of the digital signals to the analog output will produce spurious tones that vary with the exact digital input pattern. Clock ...

Page 17

U U APPLICATIO S I FOR ATIO LTC1666/LTC1667/LTC1668 ...

Page 18

LTC1666/LTC1667/LTC1668 U U APPLICATIO S I FOR ATIO Figure 11. Suggested Evaluation Circuit Board—Silkscreen ...

Page 19

U U APPLICATIO S I FOR ATIO Figure 12. Suggested Evaluation Circuit Board—Component Side LTC1666/LTC1667/LTC1668 ...

Page 20

LTC1666/LTC1667/LTC1668 U U APPLICATIO S I FOR ATIO Figure 13. Suggested Evaluation Circuit Board—GND Plane ...

Page 21

U U APPLICATIO S I FOR ATIO Figure 14. Suggested Evaluation Circuit Board—Power Plane LTC1666/LTC1667/LTC1668 ...

Page 22

LTC1666/LTC1667/LTC1668 U U APPLICATIO S I FOR ATIO Figure 15. Suggested Evaluation Circuit Board—Solder Side ...

Page 23

... FLASH SHALL NOT EXCEED .254mm (.010") PER SIDE Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights. ...

Page 24

... Low Power, 16-Bit Monotonic Over Temp., Multiplying Capability Rail-to-Rail Input and Output, Low Distortion 3.6mA Supply Current, 8nV/ Hz Input Noise Voltage www.linear.com 1k 52.3 – V OUT 100pF LT1227 10V + 1k 1666/7/8 F17 IN DAC, OUT 166678f LT/TP 0701 2K • PRINTED IN USA LINEAR TECHNOLOGY CORPORATION 2000 ...

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