- Single-channel (CS5507/8) and Four-channel
(CS5505/6) pseudo-differential versions
l Either 5 V or 3.3 V Digital Interface
l Linearity Error:
- ±0.0015% FS (16-bit CS5505/7)
- ±0.0007% FS (20-bit CS5506/8)
l Output update rates up to 100 Sps
l Flexible Serial Port
l Pin-Selectable Unipolar/Bipolar Ranges
I
The CS5505/6/7/8 are a family of low power CMOS A/D
converters which are ideal for measuring low-frequency
signals representing physical, chemical, and biological
processes.
The CS 5507/8 have single-channel differential anal
og
and reference inputs while the CS5505/6 have four
pseudo-differ
ential analog input channels. The
CS5505/7 have a 16-bit output word. The CS5506/8
have a 20-bit output word.The CS5505/6/7/8 sample
ommand up to 100 Sps
upon c
.
The on-chip digital filter offers superior li ne rejection at
50 and 60 Hz when the device is operated from a
32.768 kHz clock (output word rate = 20 Sps).
The CS 5505/6/7/8 include on-chip self-calibration circuitry whi
ch c
an be initiated at any time or temperature
to ensure minimum offset and full-scale errors.
The CS5505/6/7/8 serial port offers two general-purpose
modes for the direct interface to shift r egisters or synchr
microcontroll
to AGND at AIN; Anal og input channel AIN1+; AIN- = AGND; unless otherwise specified.) (Notes 1, 2)
CS5505/7-ACS5507-S
Parameter*MinTypMaxMinTypMaxUnits
Specified Temperature Range-40 to +85-55 to +125
°
C
Accuracy
Linearity Error-0.00150.003-0.00150.003
Differential Nonlinearity-
Full Scale Error (Note 3)-
Full Scale Drift(Note 4)-
Unipolar Offset(Note 3)-
Unipolar Offset Drift(Note 4)-
Bipolar Offset (Note 3)-
Bipolar Offset Drift(Note 4)-
±
0.25
±
0.25
±
±
±
±
0.25
±
0.25
0.5
0.5
0.5
±
0.5
±
2
--
±
2
--
±
1
--
-
-
-
-
±
0.25
±
0.5
±
2
±
1
±
1
±
0.5
±
0.5
±
0.5
±
-LSB
±
-LSB
±
-LSB
±
%FS
LSB
16
LSB
LSB
LSB
16
16
16
16
16
16
2
4
2
Noise (Referred to Output)-0.16--0.16-LSB-
rms
16
Notes: 1. The AIN pin presents a very high input resistance at dc and a minor dynamic load which scales to the
master clock frequency. Both sour ce resistance and shunt capacitance are therefore critical in
determining the CS5505/6/7/8’s source impedance requirements. For more information refer to the
text section
Analog Input Impedance Consi derations.
2. Specifications guaranteed by desi gn, characterization and/or test.
3. Applies after calibration at the temperature of interest.
4. Total drift over the specified temperature range since calibration at power-up at 25°C.
Recalibration at any temperature will remove these errors.
3.3V ± 5%; VREF+ = 2.5V (external); VREF- = 0V; f
10nF to AGND at AIN; Analog input channel AIN1+; AIN- = AGND; unless otherwise specified.) (Notes 1, 2)
Parameter*MinTypMaxMinTypMaxUnits
Specified Temperature Range-40 to +85-55 to +125
(TA = T
to T
MIN
= 32.768kHz ; Bipolar Mode; R
CLK
CS5505/7
CS5506/8CS5507/8-S
; VA+ = 5V
MAX
±
10%; VA- = -5V ± 10%; VD+ =
= 1kΩ with a
source
°
Analog Input
Analog Input Range:Unipolar
(VAIN+)-(VAIN-) Bipolar(Note 5)
Common Mode Rejection:dc
50, 60 Hz (Note 6)-120
Off Channel Isolation-120--120-dB
Input Capacitance-15--15-pF
DC Bias Current(Note 1)-5--5-nA
0 to +2.5
±
2.5
105
-
0 to +2.5
±
2.5
-
-
-
120
105
-
-
-
Volts
Volts
dB
dB
Voltage Reference (Output)
VREFOUT Voltage-(VA+)-2.5--(VA+)-2.5-Volts
VREFOUT Voltage Tolerance--4.0--4.0%
C
VREFOUT Voltage Temperature Coefficient-60--60-
VREFOUT Line Regulation-1.5--1.5-mV/Volt
VREFOUT Output Voltage Noise
0.1 to 10 Hz
VREFOUT: Source Current
Sink Current
-50- -50-
-
-
-
-
3
50
-
-
-
-
50
ppm/°C
µ
V
p-p
3
µ
A
µ
A
Power Supplies
DC Power Supply Currents:I
Power Dissipation:(Note 7)
SLEEP inactive
SLEEP active
Power Supply Rejection: Positive Supplies
Negative Supplies
Notes: 5. Common mode voltage may be at any value as long as AIN+ and AIN- remain within the VA+ and
VA- supply voltages.
6. XIN = 32.768 kHz. Guaranteed by design and / or characterization.
7. All outputs unloaded. Al l inputs CMOS levels. SLEEP mode controlled by M/SLP pin.
SLEEP active = M/SLP pin at (VD+)/2 input level.
Total
I
Analog
I
Digital
-
-
-
-
-
-
-
340
300
40
3.2
5
80
80
450
-
-
4.5
10
-
-
-
-
-
-
-
-
-
340
300
40
3.2
10
80
80
450
-
-
4.5
25
-
-
µ
A
µ
A
µ
A
mW
µ
W
dB
dB
4DS59F7
CS5505/6/7/8
DS59F75
CS5505/6/7/8
5V DIGITAL CHARACTERISTICS
(TA = T
MIN
to T
; VA+VD+ = 5V ± 10%; VA-= -5V ± 10%;
MAX
DGND = 0.) All measurements below are performed under static conditions. (Note 2)
ParameterSymbolMinTypMaxUnits
High-Level Input Voltage:XIN
M/SLP
All Pins Except XIN and M/SLP
Low-Level Input Voltage:XIN
M/SLP
All Pins Except XIN and M/SLP
M/SLP SLEEP Active Threshold(Note 8)V
High-Level Output Voltage (Note 9)V
Low Level Output Vol tage I
= 1.6 mAV
out
Input Leakage CurrentI
3-State Leakage CurrentI
Digital Output Pi n CapacitanceC
V
V
V
V
V
V
SLP
OH
OL
in
OZ
out
IH
IH
IH
IL
IL
IL
3.5
0.9VD+
2.0
-
-
-
-
-
-
-
-
-
-
-
-
1.5
0.1VD+
0.8
V
V
V
V
V
V
0.45VD+0.5VD+0.55VD+V
(VD+)-1.0--V
--0.4V
-110
--
±10µ
µ
A
A
-9-pF
Notes: 8. Under normal operation this pin should be tied to VD+ or DGND. Anytime the voltage on the M/SLP
pin enters the SLEEP active threshold range the device will enter the power down condition. Returning
to the active state r equires elapse of the power-on reset period, the oscillator to start-up, and elapse
of the wake-up period.
9. I
= -100 µA. This guarantees the ability to drive one TTL load. (VOH = 2.4V @ I
out
= -40 µA).
out
3.3V DIGITAL CHARACTERISTICS
(TA = T
MIN
to T
; VA+ = 5V ± 10%; VD+ = 3.3V ± 5%;
MAX
VA-= -5V ± 10%; DGND = 0.) All measurements below are performed under static conditions. (Note 2)
Output Float Delay:CS high to output Hi-Z (Note 16)
SCLK rising to SDATA Hi-Z
SEC Mode (M/SLP = DGND)
Serial Clock (In)f
Serial Clock (In)Pulse Width High
Pulse Width Low
Access Time: CS Low to data valid (Note 17)t
Maximum Delay time:(Note 18)
SCLK falling to new SDATA bitt
Output Float Delay:CS high to output Hi-Z (Note 16)
SCLK falling to SDATA Hi-Z
Notes: 16. If
CS is returned high before all data bits are output, the SDATA and SCLK outputs will complete the
current data bit and then go to high impedance.
CS is activated asynchronously to DRDY, CS will not be recognized if it occ urs when DRDY is high
17. If
for 2 clock cycles. The propagation delay time may be as great as 2 f
guarantee proper clocking of SDATA when using asynchronous
sooner than 2 f
+ 200 ns after
clk
CS goes low.
18. SDATA transitions on the falling edge of SCLK. Note that a rising SCLK must occur to enable the
serial port shifting mechanism before falling edges can be recognized.
Analog Reference Voltage (Note 20) (VREF+)-(VREF-)1.02.53.6V
Analog Input Voltage:(Note 21)
Unipolar
Bipolar
Notes: 19. All voltages with r espect to ground.
20. The CS5505/6/7/8 can be operated with a reference voltage as low as 100 mV; but with a
corresponding reduction in nois e-free resolution. The common mode voltage of the voltage reference
may be any value as long as +V REF and -VREF remain inside the supply values of VA+ and VA-.
21. The CS5505/6/7/8 can acc ept input voltages up to the analog supplies (VA+ and VA-). In unipolar
mode the CS5505/6/7/8 will output all 1’s if the dc input magnitude ( (AIN+)-(AIN-)) exceeds
((VREF+)-(VREF-)) and will output all 0’s if the input becomes more negative than 0 Volts.
In bipolar mode the CS5505/6/7/8 will output all 1’s if the dc input magnitude ((AIN+)-(AIN-)) exceeds
((VREF+)-(VREF-)) and will output all 0’s if the input becomes more negative in magnitude than
-((VREF+)-(VREF-)).
VD+
V
diff
VA+
VA-
VAIN
VAIN
-((VREF+)-(VREF-))--
3.15
4.75
4.5
0
0
5.0
10
5.0
-5.0
(VREF+)-(VREF-)
+((VREF+)-(VREF-))VV
5.5
11
11
-5.5
ABSOLUTE MAXIMUM RATINGS*
ParameterSymbolMinTypMaxUnits
V
V
V
V
DC Power Supplies:Digital Ground(Note 22)
Positive Digital(Note 23)
Positive Analog
Negative Analog
(VA+)-(VA-)
(VA+)-(VD+)
Input Current, Any Pin Except Supplies(Notes 24, 25)I
Analog Input VoltageAIN and VREF pinsV
Digital Input VoltageV
Ambient Operating TemperatureT
Storage TemperatureT
Notes: 22. No pin should go more positive than (VA+)+0.3V.
23. VD+ must always be less than (VA+)+0.3 V,and can never exceed 6.0V.
24. Applies to all pins including continuous overvoltage conditions at the analog input (AIN) pin.
25. Transient currents of up to 100mA will not cause SCR latch-up. Maximum input current for a power
supply pin is ± 50 mA.
* WARNING: Operation at or beyond these limits may result in permanent damage to the device.
Normal operation is not guaranteed at these extremes.
DGND
VD+
VA+
VA-
V
diff1
V
diff2
in
INA
IND
A
stg
-0.3
-0.3
-0.3
+0.3
-0.3
-0.3
--
(VA-)-0.3-(VA+)+0.3V
-0.3-(VD+)+0.3V
-55-125
-65-150
-
-
-
-
-
-
(VD+)-0.3
6.0 or VA+
12.0
-6.0
12.0
12.0
±
10
V
V
V
V
V
V
mA
°
C
°
C
12DS59F4
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