LTC2704_15 Datasheet, PDF (1/22 Pages) Linear Technology – Quad 12-, 14- and 16-Bit Voltage Output SoftSpan DACs with Readback

FEATURES
n Six Programmable Output Ranges:
Unipolar: 0V to 5V, 0V to 10V
Bipolar: ±5V, ±10V, ±2.5V, –2.5V to 7.5V
n Serial Readback of All On-Chip Registers
n 1LSB INL and DNL Over the Industrial
Temperature Range (LTC2704-14/LTC2704-12)
n Force/Sense Outputs Enable Remote Sensing
n Glitch Impulse: < 2nV-sec
n Outputs Drive ±5mA
n Pin Compatible 12-, 14- and 16-Bit Parts
n Power-On and Clear to Zero Volts
n 44-Lead SSOP Package
APPLICATIONS
n Process Control and Industrial Automation
n Direct Digital Waveform Generation
n Software Controlled Gain Adjustment
n Automated Test Equipment
LTC2704
Quad 12-, 14- and 16-Bit
Voltage Output SoftSpan
DACs with Readback
DESCRIPTION
The LTC^®2704-16/LTC2704-14/LTC2704-12 are serial
input, 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.
L, LT, LTC, LTM, Linear Technology and the Linear logo 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.
BLOCK DIAGRAM
AGND V⁺¹
32 42
V^–
REFM1 REFG1 REF1 REF2 REFG2 REFM2 V⁺² 1,8,15,22,31,36
44
2 43 24 21 23 25
VOSB 40
27 VOSC
C1B 39
28 _C1C
RFBB 37
30 _RFBC
DAC B
DAC C
OUTB 38
29 _OUTC
AGNDB 41
–1
–1
26 _AGNDC
VOSA ₄
19 VOSD
C1A 5
RFBA 7
OUTA 6
DAC A
DAC D
18 _C1D
16 RFBD
17 OUTD
AGNDA 3
33 34
GND V_DD
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
2704fd
1