MAX1080BCUP+T Maxim Integrated, MAX1080BCUP+T Datasheet - Page 12

• Manufacturer Part Number: MAX1080BCUP+T
• Description: Analog to Digital Converters - ADC 5V 400ksps Low-Power 8Ch Serial 10-Bit
• Manufacturer: Maxim Integrated

Specifications of MAX1080BCUP+T

• Rohs: yes
• Number Of Channels: 8/4
• Architecture: SAR
• Conversion Rate: 400 KSPs
• Resolution: 10 bit
• Input Type: Single-Ended/Pseudo-Differential
• Snr: 60 dB
• Interface Type: QSPI, Serial (SPI, Microwire)
• Operating Supply Voltage: 4.5 V to 5.5 V
• Maximum Operating Temperature: + 70 C
• Package / Case: TSSOP-20
• Maximum Power Dissipation: 559 mW
• Minimum Operating Temperature: 0 C
• Number Of Converters: 1
• Voltage Reference: 2.5 V

The T/H enters its tracking mode on the falling clock
edge after the fifth bit of the 8-bit control word has been
shifted in. It enters its hold mode on the falling clock
edge after the eighth bit of the control word has been
shifted in. If the converter is set up for single-ended
inputs, IN- is connected to COM and the converter con-
verts the “+” input. If the converter is set up for differen-
tial inputs, the difference of
At the end of the conversion, the positive input con-
nects back to IN+ and C
nal.
The time required for the T/H to acquire an input signal
is a function of how quickly its input capacitance is
charged. If the input signal’s source impedance is high,
the acquisition time lengthens, and more time must be
allowed between conversions. The acquisition time,
t
the signal and the minimum time needed for the signal
to be acquired. It is calculated by the following equa-
tion:
where R
300ksps/400ksps, Single-Supply, Low-Power,
8-Channel, Serial 10-Bit ADCs with Internal Reference
Table 1. Channel Selection in Single-Ended Mode (SGL/DIF = 1)
Table 2. Channel Selection in Pseudo-Differential Mode (SGL/DIF = 0)
12
ACQ
SEL2
SEL2
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
, is the maximum time the device takes to acquire
______________________________________________________________________________________
IN
SEL1
SEL1
= 800Ω, R
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
t
ACQ
= 7
SEL0
SEL0
S
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
✕
= the source impedance of the
(R
HOLD
S
[(
+ R
IN+) - (IN-)
CH0
CH0
charges to the input sig-
+
+
–
IN
)
✕
12pF
CH1
]
Track/Hold
CH1
+
is converted.
+
–
CH2
+
CH2
+
–
input signal, and t
(MAX1080) or 625ns (MAX1081). Note that source
impedances below 4kΩ do not significantly affect the
ADC’s AC performance.
The ADC’s input tracking circuitry has a 6MHz
(MAX1080) or 3MHz (MAX1081) small-signal band-
width, so it is possible to digitize high-speed transient
events and measure periodic signals with bandwidths
exceeding the ADC’s sampling rate by using under-
sampling techniques. To avoid high-frequency signals
being aliased into the frequency band of interest, anti-
alias filtering is recommended.
Internal protection diodes, which clamp the analog input
to V
from GND - 0.3V to V
However, for accurate conversions near full scale, the
inputs must not exceed V
lower than GND by 50mV.
If the analog input exceeds 50mV beyond the sup-
plies, do not allow the input current to exceed 2mA.
CH3
+
DD1
CH3
+
–
and GND, allow the channel input pins to swing
CH4
+
CH4
+
–
CH5
+
ACQ
DD1
Analog Input Protection
DD1
CH5
is never less than 468ns
+
–
+ 0.3V without damage.
by more than 50mV or be
CH6
+
Input Bandwidth
CH6
+
–
CH7
+
CH7
+
–
COM
–
–
–
–
–
–
–
–