MAX188BEWP+T Maxim Integrated Products, MAX188BEWP+T Datasheet - Page 20

• Manufacturer Part Number: MAX188BEWP+T
• Description: IC ADC 12BIT SERIAL 20-SOIC
• Manufacturer: Maxim Integrated Products
• Type: Data Acquisition System (DAS)r

Specifications of MAX188BEWP+T

• Resolution (bits): 12 b
• Sampling Rate (per Second): 133k
• Data Interface: Serial
• Voltage Supply Source: Dual ±
• Voltage - Supply: ±5V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 20-SOIC (7.5mm Width)
• 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