MAX1304 Maxim, MAX1304 Datasheet - Page 26
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MAX1304
Manufacturer Part Number
MAX1304
Description
8-/4-/2-Channel / 12-Bit / Simultaneous-Sampling ADCs with 10V / 5V / and 0 to +5V Analog Input Ranges
Manufacturer
Maxim
Datasheet
1.MAX1304.pdf
(36 pages)
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Table 3. Reference Bypass Capacitors
Table 4. Reference Voltages
8-/4-/2-Channel, 12-Bit, Simultaneous-Sampling ADCs
with ±10V, ±5V, and 0 to +5V Analog Input Ranges
To avoid the timing requirements associated with pow-
ering up an analog channel, force CHSHDN high. With
CHSHDN high, each analog input is powered up
regardless of whether it is selected for conversion in
the configuration register. Note that shutdown mode
takes precedence over the CHSHDN mode.
The internal reference circuits provide for analog input
voltages of 0 to +5V for the unipolar MAX1304/
MAX1305/MAX1306, ±5V for the bipolar MAX1308/
MAX1309/MAX1310 or ±10V for the bipolar MAX1312/
MAX1313/MAX1314. Install external capacitors for ref-
erence stability, as indicated in Table 3 and shown in
Figures 3 and 4.
As illustrated in Figure 2, the internal reference voltage
is 2.5V (V
the voltages at REF+ and REF-. Table 4 shows the volt-
ages at COM, REF+, and REF-.
External reference operation is achieved by overriding
the internal reference voltage. Override the internal ref-
N/A = Not applicable. Connect MSV directly to AGND.
26
MSV Bypass Capacitor to AGND
REF
REF Bypass Capacitor to AGND
REF+ Bypass Capacitor to AGND
REF+ to REF- Capacitor
REF- Bypass Capacitor to AGND
COM Bypass Capacitor to AGND
PARAMETER
V
REF+
MS
V
V
______________________________________________________________________________________
V
REF+
COM
REF-
- V
Bypass Capacitor to AGND
REF-
REF
). This 2.5V is internally buffered to create
V
V
V
REF+
REF-
V
LOCATION
COM
REF-
EQUATION
= V
= V
= 13 / 25 x AV
- V
COM
COM
REF+
+ V
- V
= V
REF
REF
REF
DD
/ 2
External Reference
/ 2
Internal Reference
CALCULATED VALUE (V)
Reference
(
V
AV
REF
DD
2.600
3.600
1.600
2.000
= 2.000V,
= 5.0V
UNIPOLAR (µF)
)
2.2 || 0.1
2.2 || 0.1
2.2 || 0.1
erence voltage by driving REF with a +2.0V to +3.0V
external reference. As shown in Figure 2, the REF input
impedance is 5kΩ. For more information about using
external references see the Transfer Functions section.
The voltage at MSV (V
transfer functions. For the 0 to +5V input range (unipolar
devices), the midpoint of the transfer function is +2.5V.
For the ±5V and ±10V input range devices, the midpoint
of the transfer function is zero.
As shown in Figure 2, there is a unity-gain buffer
between REF
MAX1305/MAX1306. This midscale buffer sets the mid-
point of the unipolar transfer functions to either the inter-
nal +2.5V reference or an externally applied voltage at
REF
The midscale buffer is not active for the bipolar
devices. For these devices, MSV must be connected to
AGND or externally driven. REF
with a 0.01µF capacitor to AGND.
See the Transfer Functions section for more information
about MSV.
0.01
0.01
0.1
0.1
MS
CALCULATED VALUE (V)
. V
(
INPUT VOLTAGE RANGE
MSV
V
AV
REF
follows V
DD
MS
2.600
3.850
1.350
2.500
= 2.500V,
= 5.0V
and MSV in the unipolar MAX1304/
MSV
REFMS
)
Midscale Voltage (MSV)
) sets the midpoint of the ADC
within ±3mV.
CALCULATED VALUE (V)
BIPOLAR (µF)
MS
(
2.2 || 0.1
2.2 || 0.1
V
0.01
0.01
must be bypassed
N/A
0.1
0.1
AV
REF
DD
2.600
4.100
1.100
3.000
= 3.000V,
= 5.0V
)