MAX1169BEUD Maxim Integrated, MAX1169BEUD Datasheet - Page 17

• Manufacturer Part Number: MAX1169BEUD
• Description: Analog to Digital Converters - ADC
• Manufacturer: Maxim Integrated

Specifications of MAX1169BEUD

• Number Of Channels: 1
• Architecture: SAR
• Conversion Rate: 58 KSPs
• Resolution: 16 bit
• Input Type: Single-Ended
• Snr: 90 dB
• Interface Type: I2C, Serial
• Operating Supply Voltage: 4.75 V to 5.25 V
• Maximum Operating Temperature: + 85 C
• Package / Case: TSSOP-14
• Maximum Power Dissipation: 864 mW
• Minimum Operating Temperature: - 40 C
• Number Of Converters: 1
• Voltage Reference: 4.096 V

The MAX1169 contains an internal 4.096V bandgap ref-
erence. This bandgap reference is connected to
REFADJ through a 5kΩ resistor. Bypass REFADJ with a
0.1μF capacitor to AGND. The MAX1169 reference
buffer has a unity gain to provide +4.096V at REF.
Bypass REF with a 10μF capacitor to AGND when the
internal reference is used (Figure 12).
The internal reference is adjustable to ±1.5% using the
circuit of Figure 13.
For external reference operation, disable the internal
reference by connecting REFADJ to AVDD. During con-
version, an external reference at REF must deliver up to
100μA of DC load current and have an output imped-
ance of less than 10Ω.
For optimal performance, buffer the reference through
an op amp and bypass REF with a 10μF capacitor.
Consider the MAX1169’s equivalent input noise
(38μV
The MAX1169 has a standard unipolar transfer function
with a valid analog input voltage range from V
V
(V
transitions occur halfway between successive-integer
Figure 13. Adjusting the Internal Reference
REF
REF
. Output data coding is binary with 1LSB =
RMS
/2
N
) where N is the number of bits (16). Code
) when choosing a reference.
______________________________________________________________________________________
58.6ksps, 16-Bit, 2-Wire Serial ADC
Transfer Function
REFERENCE
External Reference
BANDGAP
Internal Reference
4.096V
SAR
ADC
MAX1169
REF
DGND
A
1
V
= 1.0
4.096V
5kΩ
AGNDS
AGND
9
REFADJ
AVDD
REF
to
13
12
8
LSB values. Figure 14 shows the MAX1169 input/output
(I/O) transfer function.
Most applications require an input buffer amplifier to
achieve 16-bit accuracy. If the input signal is multi-
plexed, the input channel should be switched immedi-
ately after acquisition, rather than near the end of or
Figure 12. Internal Reference
10μF
0.1μF
0.1μF
68kΩ
in a 14-Pin TSSOP
100kΩ
POTENTIOMETER
150kΩ
REFERENCE
BANDGAP
MAX1169
4.096V
5.0V
SAR
ADC
REF
DGND
A
1
V
= 1.0
4.096V
5kΩ
AGND
9
REFADJ
REF
13
12
Input Buffer
10μF
0.1μF
17