MAX1284 Maxim, MAX1284 Datasheet - Page 11

• Manufacturer Part Number: MAX1284
• Description: 400ksps/300ksps / Single-Supply / Low-Power / Serial 12-Bit ADCs with Internal Reference
• Manufacturer: Maxim

Figure 7. Reference Power-Up vs. Time in Shutdown
Figure 8. Interface Timing Sequence
Figure 9. Detailed Serial-Interface Timing
400ksps/300ksps, Single-Supply, Low-Power,
1.50
1.25
1.00
0.75
0.50
0.25
0
Serial 12-Bit ADCs with Internal Reference
0.0001
A/D STATE
C
REF
SCLK
DOUT HIGH-Z
______________________________________________________________________________________
0.001
CS
= 4.7 F
DOUT
SCLK
TIME IN SHUTDOWN (s)
ACQ
CS
0.01
t
t
CSO
1
CSO
0.1
t
CSS
3
D11 D10 D9
1
4
t
DOE
10
HOLD/CONVERT
t
CL
D8
D7
t
CH
8
t
D6
CP
t
t
DOH
DOV
D5
The MAX1284/MAX1285 serial interface is fully compat-
ible with SPI/QSPI and MICROWIRE (Figure 11).
If a serial interface is available, set the CPU’s serial interface
in master mode so the CPU generates the serial clock.
Choose a clock frequency up to 6.4MHz (MAX1284) or
4.8MHz (MAX1285).
1) Use a general-purpose I/O line on the CPU to pull CS
2) Activate SCLK for a minimum of fifteen clock cycles.
D4
low. Keep SCLK low.
The first two clocks produce zeros at DOUT. DOUT
output data transitions 20ns after the third SCLK rising
edge and is available in MSB-first format. Observe the
D3
12
D2
Connection to Standard Interfaces
D1
Applications Information
D0
t
CSH
15
ACQUISITION
t
CSW
HIGH-Z
t
t
DOD
CSI
11