AD1845JSTZ Analog Devices Inc, AD1845JSTZ Datasheet - Page 28

• Manufacturer Part Number: AD1845JSTZ
• Description: IC CODEC AUDIO 5V 16BIT 100-TQFP
• Manufacturer: Analog Devices Inc
• Type: Stereo Audior

Specifications of AD1845JSTZ

• 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: 100-TQFP, 100-VQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

AD1845
XFS2:0
This register’s initial state after reset is “000x xxx0.”
CUB7:0
This register’s initial state after reset is “0000 0000.”
CLB7:0
This register’s initial state after reset is “0000 0000.”
Capture Upper Base Count Register (IXA3:0 = 30)
Capture Lower Base Count Register (IXA3:0 = 31)
IXA3:0
IXA3:0
30
31
Crystal/Clock Input Frequency Select. On power up or reset, the AD1845 expects a 24.576 MHz input clock. If
the clock source connected to the AD1845 is different from the default condition, then the clock input must be
selected using this register. For a detailed explanation see the Power Up and Reset section of the data sheet. Figure
13 summarizes the valid input clock frequencies. Clock sources with excessive jitter may not yield optimal analog
performance.
Capture Upper Base Count. This byte is the upper byte of the base count register containing the eight most sig-
nificant bits of the second 16-bit base register. Reads from this register return the same value that was written.
The current count contained in the counters cannot be read.
Capture Lower Base Count. This byte is the lower byte of the base count register containing the eight least signifi-
cant bits of the second 16-bit base register. Reads from this register return the same value that was written. The
current count contained in the counters cannot be read.
Data 7
Data 7
CUB7
CLB7
XFS2
0
0
0
0
1
1
1
1
Figure 13. Input Frequency Selection
Data 6
Data 6
CUB6
CLB6
XFS1
0
0
1
1
0
0
1
1
Data 5
Data 5
CUB5
CLB5
XFS0
0
1
0
1
0
1
0
1
–28–
Data 4
Data 4
CUB4
CLB4
Input Frequency
24.576
14.31818 MHz
24.000
25.000
33.000
Reserved
Reserved
Reserved
Data 3
Data 3
CUB3
CLB3
MHz
MHz
MHz
MHz
Data 2
Data 2
CUB2
CLB2
Data 1
Data 1
CUB1
CLB1
Data 0
Data 0
CUB0
CLB0
REV. C