LTC2704 반도체 회로 부품 판매점
Voltage Output SoftSpan DACs
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 Linear Technology |
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
www.DataSh■eet14UL.ScoBmINL 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 VDD
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 VREF = 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
LTC2704
ABSOLUTE MAXIMUM RATINGS
(Note 1)
Total Supply Voltage V+1, V+2 to V– ........... –0.3V to 36V
V+1, V+2, REF1, REF2, REFM1, REFM2,
OUTx, RFBx, VOSx to GND, AGND,
AGNDx, C1x, REFG1, REFG2 ................................... 18V
GND, AGND, AGNDx, C1x, REFG1, REFG2 to V+1,
V+2, V–, REF1, REF2, REFM1, REFM2, OUTx,
RFBx, VOSx ............................................................... 18V
OUTA, RFBA, VOSA, OUTB, RFBB, VOSB, REF1,
www.DataShReeEtF4UM.c1omto GND, AGND ............... V– – 0.3V to V+1 + 0.3V
OUTC, RFBC, VOSC, OUTD, RFBD, VOSD, REF2, REFM2
to GND, AGND ........................... V– – 0.3V to V+2 + 0.3V
VDD, Digital Inputs/Outputs to GND ............. –0.3V to 7V
Digital Inputs/Outputs to VDD ................................. 0.3V
GND, AGNDx, REFG1, REFG2 to AGND ................ ±0.3V
C1x to AGNDx ....................................................... ±0.3V
V– to Any Pin .......................................................... 0.3V
Maximum Junction Temperature ......................... 150°C
Operating Temperature Range
LTC2704C ............................................... 0°C to 70°C
LTC2704I ............................................ – 40°C to 85°C
Storage Temperature Range ................. – 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
PACKAGE/ORDER INFORMATION
V– 1
REFG1 2
AGNDA 3
VOSA 4
C1A 5
OUTA 6
RFBA 7
V– 8
LDAC 9
CS/LD 10
SDI 11
SRO 12
SCK 13
CLR 14
V– 15
RFBD 16
OUTD 17
C1D 18
VOSD 19
AGNDD 20
REFG2 21
V– 22
TOP VIEW
44 REFM1
43 REF1
42 V+1
41 AGNDB
40 VOSB
39 C1B
38 OUTB
37 RFBB
36 V–
35 RFLAG
34 VDD
33 GND
32 AGND
31 V–
30 RFBC
29 OUTC
28 C1C
27 VOSC
26 AGNDC
25 V+2
24 REF2
23 REFM2
ORDER PART
NUMBER
LTC2704CGW-16
LTC2704IGW-16
LTC2704CGW-14
LTC2704IGW-14
LTC2704CGW-12
LTC2704IGW-12
GW PACKAGE
44-LEAD PLASTIC SSOP
TJMAX = 125°C, θJA = 80°C/W
Order Options Tape and Reel: Add #TR
Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking: http://www.linear.com/leadfree/
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS
The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are TA = 25°C,
V+1 = V+2 = 15V, V– = –15V, VDD = 5V, REF1 = REF2 = 5V, AGND = AGNDx = REFG1 = REFG2 = GND = 0V.
SYMBOL PARAMETER
CONDITIONS
LTC2704-12
LTC2704-14
LTC2704-16
MIN TYP MAX MIN TYP MAX MIN TYP MAX UNITS
Accuracy
Resolution
● 12 14 16
Bits
Monotonicity
● 12 14 16
Bits
INL Integral Nonlinearity
VREF = 5V
DNL Differential Nonlinearity VREF = 5V
GE Gain Error
VREF = 5V
Gain Temperature
Coefficient
∆Gain/∆Temperature
● ±1
● ±1
● ±0.5 ±2
● ±2
±1
±1
±1 ±5
±2
±2 LSB
±1 LSB
±4 ±20 LSB
±2 ppm/°C
VOS Unipolar Zero-Scale Error Span = 0V to 5V, TA = 25°C
Span = 0V to 10V, TA = 25°C
Span = 0V to 5V
●
Span = 0V to 10V
●
±80 ±200
±100 ±300
±140 ±400
±150 ±600
±80 ±200
±100 ±300
±140 ±400
±150 ±600
±80 ±200
±100 ±300
±140 ±400
±150 ±600
µV
µV
µV
µV
2704f
2
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( linear )
LTC2704 data
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