LTC2704 Datasheet, PDF (1/20 Pages) Linear Technology – Quad 12-, 14- and 16-Bit Voltage Output SoftSpan DACs with Readback

FEATURES
■ _{Six Programmable Output Ranges:}
Unipolar: 0V to 5V, 0V to 10V
Bipolar: ±5V, ±10V, ±2.5V, –2.5V to 7.5V
■ _{Serial Readback of All On-Chip Registers}
■ _{1LSB INL and DNL Over the Industrial}
Temperature Range (LTC2704-14/LTC2704-12)
■ _{Force/Sense Outputs Enable Remote Sensing}
■ _{Glitch Impulse: < 2nV-sec}
■ _{Outputs Drive ±5mA}
■ _{Pin Compatible 12-, 14- and 16-Bit Parts}
■ _{Power-On and Clear to Zero Volts}
■ _{44-Lead SSOP Package}
U
APPLICATIO S
■ _{Process Control and Industrial Automation}
■ _{Direct Digital Waveform Generation}
■ _{Software Controlled Gain Adjustment}
■ _{Automated Test Equipment}
LTC2704
Quad 12-, 14- and 16-Bit
Voltage Output SoftSpan
DACs with Readback
DESCRIPTIO
The LTC^®2704-16/LTC2704-14/LTC2704-12 are serial in-
put, 12-, 14- or 16-bit, voltage output SoftSpan™ DACs
that operate from 3V to 5V logic and ±5V to ±15V analog
supplies. SoftSpan offers six output spans—two unipolar
and four bipolar—fully programmable through the 3-wire
SPI serial interface. INL is accurate to 1LSB (2LSB for the
LTC2704-16). DNL is accurate to 1LSB for all versions.
Readback commands allow verification of any on-chip
register in just one 24- or 32- bit instruction cycle. All other
commands produce a “rolling readback” response from
the LTC2704, dramatically reducing the needed number of
instruction cycles.
A Sleep command allows any combination of DACs to be
powered down. There is also a reset flag and an offset
adjustment pin for each channel.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
SoftSpan is a trademark of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
SI PLIFIED BLOCK DIAGRA
AGND V⁺¹
32 42
VOSB 40
C1B 39
RFBB 37
OUTB 38
AGNDB 41
VOSA ₄
C1A 5
DAC B
RFBA 7
OUTA 6
DAC A
AGNDA 3
33 34
GND V_DD
V^–
REFM1 REFG1 REF1 REF2 REFG2 REFM2 V⁺² 1,8,15,22,31,36
44
2 43 24 21 23 25
27 VOSC
28 _C1C
DAC C
30 _RFBC
29 _OUTC
–1
–1
26 _AGNDC
19 VOSD
DAC D
18 _C1D
16 RFBD
17 OUTD
10 13 11 14 9 35 12
CS/LD SCK SDI CLR LDAC RFLAG SRO
20 _AGNDD
2704 BD
LTC2704-16
Integral Nonlinearity (INL)
1.0 _{V+/V– = ±15V}
0.8 V_REF = 5V
±10V RANGE
0.6
ALL 4 DACS
0.4 SUPERIMPOSED
0.2
0
–0.2
–0.4
–0.6
–0.8
–1.0
0
16384
32768
CODE
49152
65535
2704 TA01b
2704f
1