16-Channel, 16-Bit/12-Bit Voltage Output DACs

16-Channel, 16-Bit/12-Bit
Voltage Output DACs
±10V VOUT SoftSpan DACs with 10ppm/°C Maximum Reference
The 16-bit/12-bit LTC®2668 combines 16 voltage output DACs with five software-programmable (SoftSpan™) or pin-configurable
output voltage ranges up to ±10V. Each output span is independently selectable per channel, with full 16-bit/12-bit resolution at
all spans. Tight DC linearity with low AC and DC crosstalk ensures precision control in multichannel open or closed-loop systems.
Additional features include an internal 16:1 analog multiplexer for calibration or monitoring circuit integrity, and a toggle function
that allows the DAC to quickly toggle between two DAC codes.
Features
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16 DACs in Small 6mm × 6mm QFN Package
Internal Precision Reference: 10ppm/°C (Max)
Independently Programmable Output Ranges: 0V to 5V,
0V to 10V, ±2.5V, ±5V, ±10V
Maximum INL Error: ±4LSB (16 Bits), ±1LSB (12 Bits)
Flexible Single or Dual Supply Operation
Guaranteed Monotonic Over Temperature
Output Buffers Drive ±10mA and 1000pF Loads
A/B Toggle via Software or Dedicated Pin
Internal 16:1 Analog MUX
Asynchronous DAC Update Pin
1.8V to 5V SPI Serial Interface
–40°C to 125°C Operation
Quad
Octal
16-Channel
16-Bit
LTC2664-16
LTC2666-16
LTC2668-16
12-Bit
LTC2664-12
LTC2666-12
LTC2668-12
Package
5mm × 5mm
QFN
5mm × 5mm
QFN
6mm × 6mm
QFN
L, LT, LTC, LTM, Linear Technology and the Linear logo are
registered trademarks and SoftSpan is a trademark of Linear
Technology Corporation. All other trademarks are the property of
their respective owners.
Internal Analog MUX
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Connect Any DAC Output to the MUX Pin
Eliminates High Pin Count External MUX
Saves Board Space
Use this Function for:
nn Calibration
nn Closed-Loop Control
nn Monitor Circuit Integrity
Output Range: V– to (V+ –1.4V)
±10V
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±10V
MUX
ADC
0V to 5V
5V
5V
5V
OVP
AVP
V+
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µC
SPI
Control Logic
0V to 5V
L
L
LTC2668
LTC2668
GND
0V to 3V
V–
3V
5V
12V
OVP
AVP
V+
L
Flexible Supply Voltages
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0V to 10V
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LTC2668
GND
0V to 1.8V
V–
1.8V
5V
+15V
OVP
AVP
V+
L
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±10V
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LTC2668
GND
V–
V+ Positive Rail
nn 4.5V to 15.75V
nn 4.6mA Operating, 35µA Shutdown
–
V Negative Rail
nn Single Supply: Connect to GND
nn Dual Supply: –4.5V to –15.75V
nn 4.6mA Operating, 27µA Shutdown
AVP DAC Core Supply
nn 4.5V to 5.5V
nn 5.4mA Operating, 1µA Shutdown
OVP Digital I/O Supply
nn 1.71V to 5.5V
nn <1µA
–15V
Buffered Voltage Outputs
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Rail-to-Rail Outputs
nn ±10mA Load, Swings within 1.4V of Rails
nn Unloaded, Swings within 10mV of Rails
Fast Settling
nn 5V/µs Slew Rate
nn 10V Step Settles to 1LSB in 9µs
Stable with Up to 1000pF of Load
+12V
±5%
L
LTC2668
–12V
±5%
±10V
1000pF
1k
A/B Toggle Function
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A
B
TGP
L
LTC2668
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Quickly Toggle Between Two DAC Codes
nn Hardware Mode Using TGP Pin
nn Software Mode Using SPI
Use this Function to:
nn Alternate Between Two Output Levels (On/Off, High/Low)
nn Dither or Modulate a DC Bias Level
nn Generate an AC Bias
www.linear.com/2668 n 1-800-4-LINEAR
0615C
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