ltc1598l Linear Technology Corporation, ltc1598l Datasheet

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ltc1598l

Manufacturer Part Number
ltc1598l
Description
4- And 8-channel, 3v Micropower Sampling 12-bit Serial I/o A/d Converters
Manufacturer
Linear Technology Corporation
Datasheet

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FEATURES
APPLICATIO S
TYPICAL
Pen Screen Digitizing
Battery-Operated Systems
Remote Data Acquisition
Isolated Data Acquisition
Battery Monitoring
Temperature Measurement
12-Bit Resolution on 3V Supply
Low Supply Current: 160 A Typ
Auto Shutdown to 1nA
Guaranteed 3/4LSB Max DNL
Guaranteed 2.7V Operation
(5V Versions Available: LTC1594/LTC1598)
Multiplexer: 4-Channel MUX (LTC1594L)
Separate MUX Output and ADC Input Pins
MUX and ADC May Be Controlled Separately
Sampling Rate: 10.5ksps
I/O Compatible with QSPI, SPI and MICROWIRE
Small Package: 16-Pin Narrow SO (LTC1594L)
0V TO 3V
ANALOG
INPUTS
RANGE
12 W, 8-Channel, 12-Bit ADC Samples at 200Hz and Runs Off a 3V Supply
APPLICATION
20
21
22
23
24
1
2
3
8
8-Channel MUX (LTC1598L)
CH0
CH1
CH2
CH3
CH4
CH5
CH6
CH7
COM
1k
24-Pin SSOP (LTC1598L)
ADC FILTER
U
OPTIONAL
8-CHANNEL
MUX
1 F
MUXOUT
18
U
17
ADCIN
+
SAMPLING
GND
12-BIT
LTC1598L
ADC
16
V
4, 9
REF
V
CC
15, 19
1594L/98L TA01
CSMUX
CSADC
D
CLK
OUT
TM
D
NC
NC
IN
12-Bit Serial I/O A/D Converters
, etc.
10
6
5, 14
7
11
12
13
3V
1 F
DESCRIPTIO
The LTC
sampling A/D converters that feature 4- and 8-channel
multiplexers, respectively. They typically draw only 160 A
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.
MICROWIRE is a trademark of National Semiconductor Corporation.
SERIAL DATA LINK
SPI COMPATABLE
MICROWIRE AND
, LTC and LT are registered trademarks of Linear Technology Corporation.
3V Micropower Sampling
MPU
®
1594L/LTC1598L are 3V micropower, 12-bit
4- and 8-Channel,
U
LTC1594L/LTC1598L
1000
100
10
1
0.1
Supply Current vs Sample Rate
T
V
V
f
CLK
A
CC
REF
= 25 C
= 2.7V
= 200kHz
= 2.5V
SAMPLE FREQUENCY (kHz)
1
10
1594L/98L TA02
100
15948lfb
1

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ltc1598l Summary of contents

Page 1

... The LTC1594L is available in a 16-pin SO package and the LTC1598L is packaged in a 24-pin SSOP. Both operate supply. The 12-bit, switched- capacitor, successive approximation ADCs include a sample-and-hold. ...

Page 2

... CS Low Time During Data Transfer WLCS 2 U RATINGS Power Dissipation .............................................. 500mW Operating Temperature Range + 0.3V) LTC1594LCS/LTC1598LCG ..................... 0.3V) LTC1594LIS/LTC1598LIG ................. – Storage Temperature Range ................. – 150 C + 0.3V) Lead Temperature (Soldering, 10 sec).................. 300 ORDER PART NUMBER 1 CH5 ...

Page 3

... CLK = 760 s, f 25kHz CYC CLK 200kHz CYC CLK LTC1594L/LTC1598L The denotes the specifications which = 25 C. (Note 5) A LTC1594LIS/LTC1598LIG MAX MIN TYP MAX 3 1. 0.05V CC – 0.05V 0.05V CC 200 200 ...

Page 4

... LTC1594L/LTC1598L AC CHARACTERISTICS otherwise specifications are C.(Note 5) A SYMBOL PARAMETER t Analog Input Sample Time SMPL f Maximum Sampling Frequency SMPL(MAX) t Conversion Time CONV t Delay Time, CLK to D Data Valid dDO OUT t Delay Time Hi-Z dis OUT t Delay Time, CLK to D Enabled ...

Page 5

... 2. 2.5V REF f = 1kHz SMPL SMPL(MAX – 45 – 40 – 25 – 20 – 35 – 30 – 15 – 10 – 5 INPUT LEVEL (dB) 1594L/98/ G11 LTC1594L/LTC1598L Change in Linearity vs Reference Voltage 200kHz CLK 0. 10.5kHz SMPL 0.35 0.30 0.25 0.20 0.15 0.10 0.05 0 2.2 2.4 2.6 1.0 1.2 1.4 1.6 1.8 2.0 REFERENCE VOLTAGE (V) 1594L/98L G06 ...

Page 6

... LTC1594L/LTC1598L W U TYPICAL PERFORMANCE CHARACTERISTICS 4096 Point FFT Plot 2.7V CC – 2.5V REF f = 3.05kHz 120kHz CLK – 7.5kHz SMPL – 60 – 80 – 100 – 120 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 FREQUENCY (kHz) 1594L/98L G13 Maximum Clock Frequency vs Source Resistance 200 190 180 ...

Page 7

... For normal operation drive this pin in parallel with CSMUX. D (Pin 11): Digital Data Output. The A/D conversion OUT result is shifted out of this output. NC (Pin 12): No Connection. NC (Pin 13): No Connection. CLK (Pin 14): Shift Clock. This input should be tied to Pin 5. LTC1594L/LTC1598L 15948lfb 7 ...

Page 8

... CH3 CH4 D OUT 1 CH5 2 CH6 8 1594L BD 3 CH7 8 COM and t Voltage Waveforms for OUT TEST POINT 1594L/98L TC01 LTC1598L 15, 19 MUXOUT ADCIN V V REF CC CSADC CSMUX 12-BIT 8-CHANNEL CLK + SAMPLING MUX D ADC IN – D OUT NC NC ...

Page 9

... NOTE 1: WAVEFORM 1 IS FOR AN OUTPUT WITH INTERNAL CONDITIONS SUCH THAT THE OUTPUT IS HIGH UNLESS DISABLED BY THE OUTPUT CONTROL. NOTE 2: WAVEFORM 2 IS FOR AN OUTPUT WITH INTERNAL CONDITIONS SUCH THAT THE OUTPUT IS LOW UNLESS DISABLED BY THE OUTPUT CONTROL. LTC1594L/LTC1598L Voltage Waveforms for ...

Page 10

... Supply Current vs Sample Rate). The ADCs automatically power down when not performing conversions, drawing only leakage current. The LTC1594L is available in a 16-pin narrow SO package and the LTC1598L is pack- aged in a 24-pin SSOP. Both devices operate on a single supply from 2.7V to 3.6V. The LTC1594L/LTC1598L contain a 12-bit, switched- capacitor ADC, sample-and-hold, serial port and an external reference input pin ...

Page 11

... CH0 TO CH7 ADCIN = MUXOUT COM = GND Figure 2. LTC1594L/LTC1598L Operating Sequence Example: All Channels Off 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 ...

Page 12

... CH1 1 0 CH2 1 0 CH3 Table 2. Logic Table for the LTC1598L Channel Selection CHANNEL STATUS All Off CH0 CH1 CH2 CH3 CH4 CH5 CH6 CH7 Transfer Curve The LTC1594L/LTC1598L are permanently configured for unipolar only. The input span and code assignment for this conversion type is illustrated below ...

Page 13

... Data is transmitted in both directions on a single wire. The processor pin connected to this data line should be configurable as either an input or an output. The LTC1594L/LTC1598L will take control of the data line after CS falling and before the 6th falling CLK while the processor takes control of the data line when CS is high ...

Page 14

... Figure 5. Use Separate Chip Selects to Maximize Sample Rate MUXOUT/ADCIN Loop Economizes Signal Conditioning The MUXOUT and ADCIN pins of the LTC1594L/LTC1598L form a very flexible external loop that allows Program- mable Gain Amplifier (PGA) and/or processing analog input signals prior to conversion. This loop is also a cost effective way to perform the conditioning, because only one circuit is needed instead of one for each channel ...

Page 15

... U APPLICATIONS INFORMATION BOARD LAYOUT CONSIDERATIONS Grounding and Bypassing The LTC1594L/LTC1598L are easy to use if some care is taken. They should be used with an analog ground plane and single point grounding techniques. The GND pin should be tied directly to the ground plane. The V pin should be bypassed to the ground plane with tantalum capacitor with leads as short as possible ...

Page 16

... Source Resistance The analog inputs of the LTC1594L/LTC1598L look like a 20pF capacitor ( channel resistance as shown in Figure 8. C switched between the selected “analog” and “COM” ...

Page 17

... Conversion speed (CLK frequency Offset with Reduced V The offset of the LTC1594L/LTC1598L has a larger effect on the output code when the ADCs are operated with reduced reference voltage. The offset (which is typically a fixed voltage) becomes a larger fraction of an LSB as the size of the LSB is reduced. The typical curve of Change in ...

Page 18

... ENOB = [S/( – 1.76]/6.02 where S/( expressed in dB. At the maximum sampling rate of 10.5kHz with a 5V supply, the LTC1594L/ LTC1598L maintain above 10.7 ENOBs at 10kHz input frequency. Above 10kHz the ENOBs gradually decline, as shown in Figure 11, due to increasing second harmonic distortion. The noise floor remains low. ...

Page 19

... U U APPLICATIONS INFORMATION specification in the Dynamic Accuracy table includes the 2nd through 5th harmonics. With a 1kHz input signal, the LTC1594L/LTC1598L have typical THD of 78dB with V = 2.7V. CC Intermodulation Distortion If the ADC input signal consists of more than one spectral component, the ADC transfer function nonlin- earity can produce intermodulation distortion (IMD) in addition to THD ...

Page 20

... EN D2 TRANSMIT WORD BYTE 1 MPU ? ? ? ? ? ? RECEIVED WORD BYTE 1 Hardware and Software Interface to Motorola MC68HC05 D OUT FROM LTC1598L STORED IN MC68HC05 RAM MSB 0 B11 B10 # # MC68HC05 CODE BPL LOOP1 Loop if not done with transfer to previous instruction BCLR 0,$02 Bit 0 Port C ($02) goes low (CS goes low) ...

Page 21

... C2). These capacitors provide fre- quency compensation for the amplifiers and help reduce the amplifier’s output impedance and improve supply rejection at high frequencies. The filter contributes less Simple Data Acquisition System Takes Advantage of the LTC1598L’s MUXOUT/ADCIN Pins to Filter Analog Signals Prior to A/D Conversion ...

Page 22

... MUX channel form the feedback for the LT1368. The gain for this amplifier the resistors above the selected MUX channel and R Using the MUXOUT/ADCIN Pins of the LTC1598L to Form a PGA. The LTC1391 MUX Allows Eight Input Channels to be Digitized LTC1391 ...

Page 23

... N .053 – .069 (1.346 – 1.752) 0 – 8 TYP .014 – .019 (0.355 – 0.483) TYP LTC1594L/LTC1598L 7.40 – 8.20 (.291 – .323) NOTE: 1. CONTROLLING DIMENSION: MILLIMETERS MILLIMETERS 2. DIMENSIONS ARE IN (INCHES) 3. DRAWING NOT TO SCALE 2.0 * DIMENSIONS DO NOT INCLUDE MOLD FLASH. MOLD FLASH SHALL NOT EXCEED .152mm (.006" ...

Page 24

... LTC1594L/LTC1598L U TYPICAL APPLICATION Using the LTC1598L and LTC1391 as an 8-Channel Differential 12-Bit ADC System 1 F LTC1391 CH0 CH0 2 CH1 3 V – CH2 4 CH3 D OUT 5 CH4 CH5 CS 7 CH6 CLK 8 CH7 CH7 GND D IN CLK CS D OUT = DAISY CHAIN CONFIGURATION FOR THE LTC1391 AND THE LTC1598L ...

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