MAX1243BESA+ Maxim Integrated Products, MAX1243BESA+ Datasheet - Page 7

• Manufacturer Part Number: MAX1243BESA+
• Description: IC ADC 10BIT SERIAL 8-SOIC
• Manufacturer: Maxim Integrated Products

Specifications of MAX1243BESA+

• Number Of Bits: 10
• Sampling Rate (per Second): 73k
• Data Interface: MICROWIRE™, QSPI™, Serial, SPI™
• Number Of Converters: 1
• Power Dissipation (max): 471mW
• Voltage Supply Source: Single Supply
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (0.154", 3.90mm Width)
• Number Of Adc Inputs: 1
• Architecture: SAR
• Conversion Rate: 73 KSPs
• Resolution: 10 bit
• Input Type: Voltage
• Interface Type: Serial
• Voltage Reference: External
• Supply Voltage (max): 5 V
• Maximum Power Dissipation: 471 mW
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

where R
ance, and t
ances below 4kΩ do not significantly affect the ADC’s
AC performance.
Higher source impedances can be used if a 0.01µF
capacitor is connected to the analog input. Note that
the input capacitor forms an RC filter with the input
source impedance, limiting the ADC’s input signal
bandwidth.
The ADC’s input tracking circuitry has a 2.25MHz
small-signal bandwidth, so it is possible to digitize
high-speed transient events and measure periodic sig-
nals with bandwidths exceeding the ADC’s sampling
rate by using undersampling techniques. To avoid
aliasing of unwanted high-frequency signals into the
frequency band of interest, anti-alias filtering is recom-
mended.
Internal protection diodes, which clamp the analog
input to V
GND - 0.3V to V
for accurate conversions near full scale, the input must
not exceed V
GND by 50mV.
If the analog input exceeds 50mV beyond the supplies,
limit the input current to 2mA.
Figure 3. Operational Diagram
+2.7V to +5.25V
ANALOG INPUT
SHUTDOWN
*4.7 F, MAX1242
REFERENCE
MAX1243
0V TO V
0.1 F, MAX1243
INPUT
INPUT
IN
REF
4.7 F 0.1 F
DD
= 9kΩ, R
ACQ
DD
and GND, allow the input to swing from
is never less than 1.5µs. Source imped-
DD
by more than 50mV, or be lower than
_______________________________________________________________________________________
C*
S
+ 0.3V without damage. However,
1
2
3
4
= the input signal’s source imped-
V
AIN
SHDN
REF
DD
MAX1242
MAX1243
Analog Input Protection
+2.7V to +5.25V, Low-Power, 10-Bit
DOUT
SCLK
GND
CS
8
7
6
5
Input Bandwidth
SERIAL
INTERFACE
The MAX1242 has an on-chip voltage reference
trimmed to 2.5V. The internal reference output is con-
nected to REF and also drives the internal capacitive
DAC. The output can be used as a reference voltage
source for other components and can source up to
400µA. Bypass REF with a 4.7µF capacitor. Larger
capacitors increase wake-up time when exiting shut-
down (see Using
The internal reference is enabled by pulling the SHDN
pin high. Letting SHDN float disables the internal refer-
ence, which allows the use of an external reference, as
described in the External Reference section.
The MAX1242/MAX1243 operate with an external refer-
ence at the REF pin. To use the MAX1242 with an
external reference, disable the internal reference by let-
ting SHDN float. Stay within the voltage range 1.0V to
V
impedance is 18kΩ for DC currents. During conver-
sion, the external reference must be able to deliver up
to 250µA of DC load current and have an output
impedance of 10Ω or less. The recommended mini-
mum value for the bypass capacitor is 0.1µF. If the ref-
erence has higher output impedance or is noisy,
bypass it close to the REF pin with a 4.7µF capacitor.
Figure 4. Equivalent Input Circuit
DD
GND
AIN
to achieve specified accuracy. The minimum input
Serial ADCs in SO-8
REF
TRACK INPUT
HOLD
CAPACITIVE DAC
C
SWITCH
SHDN to Reduce Supply Current ).
C
-
16pF
HOLD
TRACK
+
Internal Reference (MAX1242)
R
9k
IN
HOLD
ZERO
AT THE SAMPLING INSTANT,
THE INPUT SWITCHES FROM
AIN TO GND.
External Reference
COMPARATOR
7