MAX1282EVC16 Maxim Integrated Products, MAX1282EVC16 Datasheet - Page 16

• Manufacturer Part Number: MAX1282EVC16
• Description: EVAL KIT FOR MAX1282
• Manufacturer: Maxim Integrated Products

Specifications of MAX1282EVC16

• Number Of Adc's: 1
• Number Of Bits: 12
• Sampling Rate (per Second): 400k
• Data Interface: Serial
• Inputs Per Adc: 4 Single Ended
• Input Range: ±VREF/2
• Power (typ) @ Conditions: 13.75mW @ 400kSPS
• Voltage Supply Source: Single Supply
• Operating Temperature: 0°C ~ 70°C
• Utilized Ic / Part: MAX1282
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

300ksps/400ksps, Single-Supply, 4-Channel,
Serial 12-Bit ADCs with Internal Reference
FASTPD and REDP modes achieve the lowest power
consumption at speeds close to the maximum sampling
rate. Figure 10 shows the MAX1283’s power
consumption in FASTPD mode (PD1 = 0, PD0 = 1),
REDP mode (PD1 = 1, PD0 = 0), and, for comparison,
normal operating mode (PD1 = 1, PD0 = 1). The figure
shows power consumption using the specified power-
down mode, with the internal reference and conversion
controlled at the maximum clock speed. The clock
speed in FASTPD or REDP should be limited to 4.8MHz
for the MAX1282/MAX1283. FULLPD mode may provide
increased power savings in applications where the
MAX1282/MAX1283 are inactive for long periods of time,
but intermittent bursts of high-speed conversions are
required. Figure 11b shows FASTPD and REDP timing.
The MAX1282/MAX1283 can be used with an internal
or external reference voltage. An external reference
can be connected directly at REF or at the REFADJ pin.
Figure 6. Detailed Serial-Interface Timing
Table 5. Full Scale and Zero Scale
16
______________________________________________________________________________________
V
REF
Full Scale
SSTRB
Internal and External References
DOUT
SCLK
+ V
DIN
CS
COM
t
STE
t
UNIPOLAR MODE
CSO
t
DS
t
CSS
and Reduced-Power Modes
Using Fast Power-Down
t
DOE
t
DH
t
CL
Zero Scale
V
t
CH
COM
#10
An internal buffer is designed to provide 2.5V at
REF for the MAX1282/MAX1283. The internally trimmed
1.22V reference is buffered with a 2.05 gain.
The MAX1282/MAX1283’s full-scale range with the inter-
nal reference is 2.5V with unipolar inputs and ±1.25V
with bipolar inputs. The internal reference voltage is
adjustable by ±100mV with the circuit in Figure 12.
The MAX1282/MAX1283’s external reference can be
placed at the input (REFADJ) or the output (REF) of the
internal reference-buffer amplifier. The REFADJ input
impedance is typically 17kΩ. At REF, the DC input
resistance is a minimum of 18kΩ. During conversion, an
external reference at REF must deliver up to 350µA DC
load current and have 10Ω or less output impedance. If
the reference has a higher output impedance or is
noisy, bypass it close to the REF pin with a 4.7µF
capacitor.
t
CP
t
t
DOH
DOV
t
Full Scale
STH
Positive
t
V
+ V
STV
REF
COM
/ 2
BIPOLAR MODE
t
CSH
Scale
V
Zero
COM
t
CSW
t
t
t
CS1
DOD
STD
External Reference
Internal Reference
Full Scale
Negative
V
+ V
REF
COM
/ 2