AD1845JP-REEL Analog Devices Inc, AD1845JP-REEL Datasheet - Page 19

• Manufacturer Part Number: AD1845JP-REEL
• Description: IC CODEC STEREO 5V 16BIT 68PLCC
• Manufacturer: Analog Devices Inc
• Type: Stereo Audior

Specifications of AD1845JP-REEL

• Rohs Status: RoHS non-compliant
• Resolution (bits): 16 b
• Number Of Adcs / Dacs: 2 / 2
• Sigma Delta: Yes
• Dynamic Range, Adcs / Dacs (db) Typ: 81 / 82
• Voltage - Supply, Analog: 4.75 V ~ 5.25 V
• Voltage - Supply, Digital: 4.75 V ~ 5.25 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 68-PLCC

NOTE: Placing the AD1845 in the Mode Change Enable (MCE) state is not required when changing the sample rate. However,
changes to FMT[1:0], C/L, and S/M require MCE or setting PEN = 0.
CSS
CFS2:0
S/M
C/L
FMT[1:0]
res
This register’s initial state after reset is “0000 0000.”
REV. C
Clock and Data Format Register (IXA3:0 = 8)
IXA3:0
8
FMT1
0
0
0
0
1
1
1
1
Reserved for future expansion. Always write a zero to this bit.
Clock Source Select. This bit in conjunction with CFS2:0 selects the audio sample rate frequency. See Figure 8
below. Note: MODE2 allows a wider range of sample rate frequencies to be selected by using the Frequency
Select Register (refer to Registers 22 and 23).
Clock Frequency Divide Select. These bits in conjunction with CSS select the audio sample frequency.
Stereo/Mono Select. This bit determines how the audio data streams are formatted. Selecting stereo will result
with alternating samples representing left and right audio channels. Mono playback plays the same audio sample
on both channels. Mono capture only captures data from the left audio channel.
0
1
Companded/Linear Select. This bit selects between a linear digital representation of the audio signal or a nonlinear,
companded format for all input and output data. The type of linear PCM or the type of companded format is
defined by the FMT bits.
0
1
Format Select. The bits define the format for all digital audio input and outputs based on the state of the C/L bit.
See Figure 9 for FMT and C/L bit settings that determine the audio data type format.
Data 7
FMT1
Mono
Stereo
Linear PCM
Companded
FMT0
0
0
1
1
0
0
1
1
CFS2
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
FMT0
Data 6
Figure 8. MODE1 Audio Sample Frequency Select
CFS1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
Figure 9. Digital Audio Data Type
Data 5
C/L
C/L
0
1
0
1
0
1
0
1
CFS0
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
–19–
Data 4
S/M
CSS
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
Audio Data Type
Linear, 8-Bit Unsigned PCM
Linear, 16-Bit Twos-Complement PCM Little Endian
A-Law, 8-Bit Companded
Reserved
Reserved
Linear, 16-Bit Twos Complement Big Endian
Reserved
-Law, 8-Bit Companded
Data 3
CFS2
Sample Rate
16.0
11.025
27.42857 kHz
18.9
32.0
22.05
Reserved
37.8
Reserved
44.1
48.0
33.075
8.0
5.5125
9.6
6.615
Data 2
CFS1
kHz
kHz
kHz
kHz
kHz
kHz
kHz
kHz
kHz
kHz
kHz
kHz
kHz
Data 1
CFS0
Data 0
AD1845
CSS