MAX148BEAP Maxim Integrated Products, MAX148BEAP Datasheet - Page 12

• Manufacturer Part Number: MAX148BEAP
• Description: ADC (A/D Converters)
• Manufacturer: Maxim Integrated Products

Specifications of MAX148BEAP

• Number Of Adc Inputs: 8
• Architecture: SAR
• Conversion Rate: 133 KSPs
• Resolution: 10 bit
• Input Type: Voltage
• Interface Type: 4-Wire (SPI, QSPI, Microwire, TMS320)
• Voltage Reference: Internal 2.5 V or External
• Supply Voltage (max): 5 V
• Maximum Power Dissipation: 640 mW
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: SSOP-20
• Minimum Operating Temperature: - 40 C
• Lead Free Status / Rohs Status: No

+2.7V to +5.25V, Low-Power, 8-Channel,
Serial 10-Bit ADCs
The T/H acquires the input signal as the last three bits of
the control byte are clocked into DIN. Bits PD1 and PD0
of the control byte program the clock mode. Figures 7–10
show the timing characteristics common to both modes.
In external clock mode, the external clock not only shifts
data in and out, but it also drives the analog-to-digital
conversion steps. SSTRB pulses high for one clock period
after the last bit of the control byte. Successive- approxi-
mation bit decisions are made and appear at DOUT on
each of the next 12 SCLK falling edges (Figure 6). SSTRB
Figure 7. Detailed Serial-Interface Timing
Figure 8. External Clock Mode SSTRB Detailed Timing
12
_____________________________________________________________________________________
DOUT
SCLK
DIN
CS
SSRTB
SCLK
CS
t
CSH
t
DV
t
CSS
t
DS
t
DH
t
SDV
External Clock
t
CL
PD0 CLOCKED IN
t
CH
and DOUT go into a high-impedance state when CS goes
high; after the next CS falling edge, SSTRB outputs a
logic-low. Figure 8 shows the SSTRB timing in external
clock mode.
The conversion must complete in some minimum time, or
droop on the sample-and-hold capacitors may degrade
conversion results. Use internal clock mode if the serial-
clock frequency is less than 100kHz, or if serial-clock
interruptions could cause the conversion interval to
exceed 120Fs.
t
SSTRB
t
DO
t
SSTRB
t
CSH
t
TR
t
STR