SX8723CWLTDT SEMTECH [Semtech Corporation], SX8723CWLTDT Datasheet - Page 33

• Manufacturer Part Number: SX8723CWLTDT
• Description: ZoomingADC for sensing data acquisition
• Manufacturer: SEMTECH [Semtech Corporation]

Revision 1.01
© Semtech
In "continuous-time" mode, the input signal is repeatedly converted into digital. After a conversion is finished, a new
one is automatically initiated. The new value is then written in the result register, and the corresponding internal
trigger pulse is generated. This operation is sketched in
In the "on-request" mode, the internal behavior of the converter is the same as in the "continuous-time" mode, but the
conversion is initiated on user request (with the Start bit). As shown in
7.7.8 Output Code Format
The ADC output code is a 16-bit word in two's complement format (see
the output code is saturated to the closest full-scale value (i.e. 0x7FFF or 0x8000). For resolutions smaller than 16 bits,
the non-significant bits are forced to the values shown in
Recalling
ADVANCED COMMUNICATIONS & SENSING
Equation 10, page
Internal trig
Output code RegACOut[15:0]
Busy
Ready
Internal trig
START Request
Output code RegACOut[15:0]
Busy
Ready
OUT
January 2011
ADC
25, this can be rewritten as:
=
2
16
Figure 17. ADC “Continuous-Time” Operation
⋅
V
V
Figure 18. ADC “On-Request” Operation
OUT
REF
IN
⋅
⎛
⎜ ⎜
⎝
ADC
GD
1/fs
TOT
=
Equation 18
Equation 19
Page 33
2
−
16
Figure
GDoff
Table
⋅
V
V
IN
REF
,
ADC
TOT
17. The conversion time in this case is defined as T
Tconv
Tconv
20. The output code, expressed in LSBs, corresponds to:
ZoomingADC for sensing data acquisition
⋅
⋅
S
OSR
⋅
OSR
V
Figure
Table
V
REF
IN
+
⎞
⋅ ⎟ ⎟
⎠
1
19). For input voltages outside the range,
18, the conversion time is also T
OSR
OSR
+
1
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SX8723C
DATASHEET
CONV
CONV
.
.