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PDF LTC1594L Data sheet ( Hoja de datos )
| Número de pieza | LTC1594L | |
| Descripción | 4- and 8-Channel/ 3V Micropower Sampling 12-Bit Serial I/O A/D Converters | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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LTC1594L/LTC1598L
4- and 8-Channel,
3V Micropower Sampling
12-Bit Serial I/O A/D Converters
FEATURES
s 12-Bit Resolution on 3V Supply
s Low Supply Current: 160µA Typ
s Auto Shutdown to 1nA
s Guaranteed ±3/4LSB Max DNL
s Guaranteed 2.7V Operation
(5V Versions Available: LTC1594/LTC1598)
s Multiplexer: 4-Channel MUX (LTC1594L)
8-Channel MUX (LTC1598L)
s Separate MUX Output and ADC Input Pins
s MUX and ADC May Be Controlled Separately
s Sampling Rate: 10.5ksps
s I/O Compatible with QSPI, SPI and MICROWIRETM, etc.
s Small Package: 16-Pin Narrow SO (LTC1594L)
2U4-Pin SSOP (LTC1598L)
APPLICATIO S
s Pen Screen Digitizing
s Battery-Operated Systems
s Remote Data Acquisition
s Isolated Data Acquisition
s Battery Monitoring
s Temperature Measurement
DESCRIPTIO
The LTC®1594L/LTC1598L are 3V micropower, 12-bit
sampling A/D converters that feature 4- and 8-channel
multiplexers, respectively. They typically draw only 160µA
of supply current when converting and automatically
power down to a typical supply current of 1nA between
conversions. The LTC1594L is available in a 16-pin SO
package and the LTC1598L is packaged in a 24-pin
SSOP. Both operate on a 3V supply. The 12-bit, switched-
capacitor, successive approximation ADCs include a
sample-and-hold.
On-chip serial ports allow efficient data transfer to a wide
range of microprocessors and microcontrollers over three
or four wires. This, coupled with micropower consump-
tion, makes remote location possible and facilitates trans-
mitting data through isolation barriers.
The circuit can be used in ratiometric applications or with
an external reference. The high impedance analog inputs
and the ability to operate with reduced spans (to 1.5V full
scale) allow direct connection to sensors and transducers
in many applications, eliminating the need for gain stages.
, LTC and LT are registered trademarks of Linear Technology Corporation.
MICROWIRE is a trademark of National Semiconductor Corporation.
TYPICAL APPLICATION
12µW, 8-Channel, 12-Bit ADC Samples at 200Hz and Runs Off a 3V Supply
OPTIONAL
ADC FILTER
1k 1µF
3V
ANALOG
INPUTS
0V TO 3V
RANGE
20 CH0
21 CH1
22 CH2
23 CH3
24 CH4
1 CH5
2 CH6
3 CH7
18
MUXOUT
8-CHANNEL
MUX
8 COM
17
ADCIN
16 15, 19
VREF VCC
12-BIT
+ SAMPLING
ADC
–
CSADC
CSMUX
CLK
DIN
DOUT
1µF
10
6
5, 14
7
11
SERIAL DATA LINK
MICROWIRE AND
SPI COMPATABLE
MPU
LTC1598L
GND
4, 9
12
NC
13
NC
1594L/98L TA01
Supply Current vs Sample Rate
1000
100
TA = 25°C
VCC = 2.7V
VREF = 2.5V
fCLK = 200kHz
10
1
0.1
1 10
SAMPLE FREQUENCY (kHz)
100
1594L/98L TA02
1
1 page  
TYPICAL PERFORMANCE CHARACTERISTICS
LTC1594L/LTC1598L
Change in Offset
vs Reference Voltage
3.0
TA = 25°C
VCC = 2.7V
2.5 fCLK = 200kHz
fSMPL = 10.5kHz
2.0
1.5
1.0
0.5
0
0.5
1.0 1.5 2.0 2.5
REFERENCE VOLTAGE (V)
3.0
1594L/98L G04
Change in Gain
vs Reference Voltage
–10
–9
TA = 25°C
VCC = 2.7V
–8
fCLK = 200kHz
fSMPL = 10.5kHz
–7
–6
–5
–4
–3
–2
–1
0
1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 2.8
REFERENCE VOLTAGE (V)
1594L/98L G07
Spurious Free Dynamic Range
vs Input Frequency
100
90
80
70
60
50
40
30
20
TA = 25°C
VCC = 2.7V
10 VREF = 2.5V
fSMPL = fSMPL(MAX)
0
1 10
INPUT FREQUENCY (kHz)
100
1594L/98L G10
Change in Offset vs Temperature
0.20
VCC = 2.7V
0.15 VREF = 2.5V
fCLK = 200kHz
0.10 fSMPL = fSMPL(MAX)
0.05
0
– 0.05
– 0.10
– 0.15
– 0.20
0 10 20 30 40 50 60 70
TEMPERATURE (°C)
1594L/98L G05
Differential Nonlinearity vs Code
1
TA = 25°C
VCC = 2.7V
VREF = 2.5V
0.5 fCLK = 200kHz
0
– 0.5
–1
0 512 1024 1536 2048 2560 3072 3584 4096
CODE
1594L/98L G08
S/(N + D) vs Input Level
80
TA = 25°C
70 VCC = 2.7V
VREF = 2.5V
60
fIN = 1kHz
fSMPL = fSMPL(MAX)
50
40
30
20
10
0
– 45 – 40 – 35 – 30 – 25 – 20 – 15 – 10 – 5 0
INPUT LEVEL (dB)
1594L/98/ G11
Change in Linearity
vs Reference Voltage
0.50
0.45
TA = 25°C
VCC = 2.7V
0.40 fCLK = 200kHz
fSMPL = 10.5kHz
0.35
0.30
0.25
0.20
0.15
0.10
0.05
0
1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 2.8
REFERENCE VOLTAGE (V)
1594L/98L G06
Effective Bits and S/(N + D)
vs Input Frequency
12 74
11 68
10 62
9 56
8 50
7
6
5
4
3 TA = 25°C
2 VCC = 2.7V
1
fCLK = 200kHz
fSMPL = 10.5kHz
0
1
10
INPUT FREQUENCY (kHz)
100
1594L/98L G09
Frequency Response
0
10
20
30
40
50
60
70 (MUX + ADC)
TA = 25°C
80 VCC = 2.7V
90
VREF = 2.5V
fSMPL = fSMPL(MAX)
100
1k 10k 100k
1M
INPUT FREQUENCY (Hz)
10M
1594L/98L G12
5
5 Page 
APPLICATIONS INFORMATION
CSMUX = CSADC = CS
CLK
tsuCS
tCYC
LTC1594L/LTC1598L
DIN
DOUT
CH0 TO
CH7
ADCIN =
MUXOUT
COM = GND
EN D1
D2 D0
Hi-Z
NULL
BIT
tOFF
D0N‘T CARE
DUMMY CONVERSION
tCONV
Figure 2. LTC1594L/LTC1598L Operating Sequence Example: All Channels Off
Hi-Z
1594L/98L F02
Data Transfer
The CLK synchronizes the data transfer with each bit
being transmitted on the falling CLK edge and captured
on the rising CLK edge in both transmitting and receiving
systems.
The LTC1594L/LTC1598L first receive input data and
then transmit back the A/D conversion results (half
duplex). Because of the half duplex operation, DIN and
DOUT may be tied together allowing transmission over
just 3 wires: CS, CLK and DATA (DIN/DOUT).
Data transfer is initiated by a rising chip select (CS)
signal. After CS rises, the input data on the DIN pin is
latched into a 4-bit register on the rising edge of the clock.
More than four input bits can be sent to the DIN pin
without problems, but only the last four bits clocked in
before CS falls will be stored into the 4-bit register. This
4-bit input data word will select the channel in the
muliplexer (see Input Data Word and Tables 1 and 2). To
ensure correct operation, the CS must be pulled low
before the next rising edge of the clock.
Once the CS is pulled low, all channels are simulta-
neously switched off after a delay of tOFF to ensure a
break-before-make interval, tOPEN. After a delay of tON
(tOFF + tOPEN), the selected channel is switched on,
allowing the ADC in the chip to acquire input signal and
start the conversion (see Figures 1 and 2). After 1 null bit,
the result of the conversion is output on the DOUT line.
The selected channel remains on, until the next falling
edge of CS. At the end of the data exchange, CS should
be brought high. This resets the LTC1594L/LTC1598L
and initiates the next data exchange.
CS
SHIFT MUX
ADDRESS IN
DIN1
DOUT1
tSMPL + 1 NULL BIT
DIN2
DOUT2
SHIFT A/D CONVERSION
RESULT OUT
1594L/98L AI01
Break-Before-Make
The LTC1594L/LTC1598L provide a break-before-make
interval from switching off all the channels simulta-
neously to switching on the next selected channel once
CS is pulled low. In other words, once CS is pulled low,
11
11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet LTC1594L.PDF ] | |
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