MAX1069_10 Datasheet, PDF (16/20 Pages) Maxim Integrated Products – 58.6ksps, 14-Bit, 2-Wire Serial ADC in a 14-Pin TSSOP

58.6ksps, 14-Bit, 2-Wire Serial ADC
in a 14-Pin TSSOP
MASTER TO SLAVE
SLAVE TO MASTER
A. SINGLE CONVERSION
1
7
S SLAVE ADDRESS
11
8
1
8
11
R A CLOCK STRETCH
RESULT
A
RESULT
A P OR Sr
(MOST SIGNIFICANT BYTE) (LEAST SIGNIFICANT BYTE)
t_ACQ
t_CONV
NUMBER OF BITS
B. CONTINUOUS CONVERSIONS
1
7
11
8
1
8
1
8
1
S SLAVE ADDRESS R A CLOCK STRETCH
RESULT #1
A
RESULT #1
A CLOCK STRETCH
RESULT #2
A
(MOST SIGNIFICANT BYTE) (LEAST SIGNIFICANT BYTE)
(MOST SIGNIFICANT BYTE)
t_ACQ
t_CONV
t_ACQ
t_CONV
NUMBER OF BITS
C. ACQUISITION DETAIL
8
1
8
1
8
11
RESULT #2
A CLOCK STRETCH
RESULT #N
A
RESULT #N
A P OR Sr
(LEAST SIGNIFICANT BYTE)
(MOST SIGNIFICANT BYTE) (LEAST SIGNIFICANT BYTE)
t_ACQ
t_CONV
NUMBER OF BITS
SDA BIT3
BIT2
BIT1
BIT0
A
D13
D12
D11
D10
SCL 5
6
7
8
9
CLOCK STRETCH
1
2
3
4
t_AJ
t_AD
t_ACQ
t_CONV
ANALOG INPUT
TRACK AND HOLD
HOLD
TRACK
HOLD
Figure 11. Read Cycle
If the internal reference is used and R/W = 0, shutdown
occurs when the master issues a not-acknowledge bit
while reading the conversion results. The internal refer-
ence and internal reference buffer are disabled during
shutdown, reducing the analog supply current to less
than 1µA.
A dummy conversion is required to power up the inter-
nal reference. The MAX1069 internal reference begins
powering up from shutdown on the 9th falling edge of a
valid address byte. Allow 12ms for the internal refer-
ence to settle before obtaining valid conversion results.
Reference Voltage
The MAX1069 provides an internal or accepts an exter-
nal reference voltage. The ADC input range is from
V_AGNDS to V_REF (see the Transfer Function section).
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