MAX186DCWP+ Maxim Integrated Products, MAX186DCWP+ Datasheet - Page 20
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MAX186DCWP+
Manufacturer Part Number
MAX186DCWP+
Description
IC DAS 8CH 12BIT T/H LP 20-SOIC
Manufacturer
Maxim Integrated Products
Type
Data Acquisition System (DAS), ADCr
Datasheet
1.MAX188DCPP.pdf
(24 pages)
Specifications of MAX186DCWP+
Resolution (bits)
12 b
Sampling Rate (per Second)
133k
Data Interface
Serial
Voltage Supply Source
Dual ±
Voltage - Supply
±5V
Operating Temperature
0°C ~ 70°C
Mounting Type
Surface Mount
Package / Case
20-SOIC (7.5mm Width)
Number Of Adc Inputs
8
Architecture
SAR
Conversion Rate
133 KSPs
Resolution
12 bit
Input Type
Voltage
Interface Type
4-Wire (SPI, QSPI, MICROWIRE, TMS320)
Voltage Reference
Internal 4.096 V or External
Supply Voltage (max)
5 V
Maximum Power Dissipation
800 mW
Maximum Operating Temperature
+ 70 C
Mounting Style
SMD/SMT
Input Signal Type
Single-Ended, Pseudo-Differential, Differential
Minimum Operating Temperature
0 C
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Low-Power, 8-Channel,
Serial 12-Bit ADCs
Figure 18. Power-Supply Grounding Connection
Figure 19. MAX186 QSPI Connection
20
______________________________________________________________________________________
* OPTIONAL
V
+5V
ANALOG
DD
INPUTS
R* = 10
MAX186/MAX188
AGND
10
1
2
3
4
5
6
7
8
9
SUPPLIES
V
-5V
SHDN
SS
CH0
CH1
CH2
CH3
CH4
CH5
CH6
CH7
V
SS
DGND
MAX186
REFADJ
SSTRB
DGND
DOUT
AGND
SCLK
VREF
V
+5V
DIN
CIRCUITRY
CS
DD
DIGITAL
20
19
18
17
16
15
14
13
12
11
DGND
GND
0.1µF
0.1µF
+
4.7µF
4.7µF
The MAX186/MAX188 can interface with QSPI at high
throughput rates using the circuit in Figure 19. This
QSPI circuit can be programmed to do a conversion on
each of the eight channels. The result is stored in mem-
ory without taxing the CPU since QSPI incorporates its
own micro-sequencer. Figure 19 depicts the MAX186,
but the same circuit could be used with the MAX188 by
adding an external reference to VREF and connecting
REFADJ to V
Figure 20 details the code that sets up QSPI for
autonomous operation. In external clock mode, the
MAX186/MAX188 perform a single-ended, unipolar con-
version on each of their eight analog input channels.
Figure 21, QSPI Assembly-Code Timing, shows the tim-
ing associated with the assembly code of Figure 20. The
first byte clocked into the MAX186/MAX188 is the control
byte, which triggers the first conversion on CH0. The last
two bytes clocked into the MAX186/MAX188 are all zero
and clock out the results of the CH7 conversion.
High-Speed Digital Interfacing with QSPI
0.01µF
+5V
* CLOCK CONNECTIONS NOT SHOWN
DD
.
SCK
PCS0
MOSI
MISO
V
DDI
, V
V
DDE
SSI
MC68HC16
, V
DDSYN
VSSE
, V
STBY