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AD1879 Arkusz danych(PDF) 5 Page - Analog Devices

Numer części AD1879
Szczegółowy opis  High Performance 16-/18-Bit Stereo ADCs
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Strona internetowa  http://www.analog.com
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AD1879 Arkusz danych(HTML) 5 Page - Analog Devices

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AD1878/AD1879
REV. 0
–5–
DEFINITIONS
Dynamic Range
The ratio of a full-scale output signal to the integrated output
noise in the passband (0 kHz to 20 kHz), expressed in decibels
(dB). Dynamic range is measured with a –60 dB input signal
and is equal to (S/[THD+N]) + 60 dB.
Signal to (Noise + Distortion)
The ratio of the root-mean-square (rms) value of the fundamen-
tal input signal to the rms sum of all spectral components in the
passband, expressed in decibels (dB).
Signal to Total Harmonic Distortion (THD)
The ratio of the rms sum of all harmonically related spectral
components in the passband to the fundamental input signal,
expressed either as a percentage (%) or in decibels (dB).
Passband
The region of the frequency spectrum unaffected by the attenu-
ation of the digital decimator’s filter.
Passband Ripple
The peak-to-peak variation in amplitude response from equal
amplitude input signal frequencies within the passband, ex-
pressed in decibels.
Stopband
The region of the frequency spectrum attenuated by the digi-
tal decimator’s filter to the degree specified by “stopband
attenuation.”
Gain Error
With a near full-scale input, the ratio of actual output to ex-
pected output, expressed as a percentage.
Interchannel Gain Mismatch
With near full-scale inputs, the ratio of outputs of the two stereo
channels, expressed in decibels.
Gain Drift
Change in response to a near full-scale input with a change in
temperature, expressed as parts-per-million (ppm) per
°C.
Midscale Offset Error
Output response to a midscale input (i.e., zero volts dc), ex-
pressed in least-significant bits (LSBs).
Midscale Drift
Change in midscale offset error with a change in temperature,
expressed as parts-per-million (ppm) of full scale per
°C.
Crosstalk
Ratio of response on one channel with a grounded input to a
full-scale 1 kHz sine-wave input on the other channel, expressed
in decibels.
Interchannel Phase Deviation
Difference in input sampling times between stereo channels, ex-
pressed as a phase difference in degrees between 1 kHz inputs.
Power Supply Rejection
With analog inputs grounded, energy at the output when a
300 mV p-p signal is applied to power supply pins, expressed in
decibels of full scale.
Group Delay
Intuitively, the time interval required for an input pulse to ap-
pear at the converter’s output, expressed in milliseconds (ms).
More precisely, the derivative of radian phase with respect to
radian frequency at a given frequency.
Group Delay Variation
The difference in group delays at different input frequencies.
Specified as the difference between largest and the smallest
group delays in the passband, expressed in microseconds (
µs).
AD1878/AD1879 PIN LIST
Pin Input/Output Pin Name Description
11
I/O
LRCK
Left/Right Clock
12
I/O
BCK
Bit Clock
13
I
S0
Mode Select 0
14
I
64/32
Bit Rate Select
15I
DVDD
+5 V Digital Supply
16
I
DGND
Digital Ground
17
N/C
No Connection; Do Not Connect
18I
AVSS1
–5 V Analog Supply
19I
AVSS2
–5 V Analog Logic Supply
10
I
AGND
Analog Ground
11
I
APD
Analog Power Down
12
I
VINR–
Right Inverting Input
13
I
VINR+
Right Noninverting Input
14
I/O
REFR
Right Reference Capacitor
15
I/O
REFL
Left Reference Capacitor
16
I
VINL+
Left Noninverting Input
17
I
VINL–
Left Inverting Input
18
I
AGND
Analog Ground
19
I
AVDD1
+5 V Analog Supply
20
I
AVDD2
+5 V Analog Logic Supply
21
I
AVSS1
–5 V Analog Supply
22
I
DVDD
+5 V Digital Supply
23
I
DGND
Digital Ground
24
I
RESET
Reset
25
I
S1
Mode Select 1
26
I
CLOCK
Master Clock Input
27
O
DATA
Serial Data Output
28
I/O
WCK
Word Clock
THEORY OF OPERATION
∑∆ Modulator Noise-Shaping
The stereo, differential analog modulators of the AD1878/
AD1879 employ a proprietary feedforward and feedback archi-
tecture that passes input signals in the audio band with a unity
transfer function yet simultaneously shape the quantization
noise generated by the one-bit comparator out of the audio
band. See Figure 1. Without the
∑∆ architecture, this quantiza-
tion noise would be spread uniformly from dc to one-half the
oversampling frequency, 64
× F
S. (Regardless of architecture,
64 times oversampling by itself significantly reduces the quanti-
zation noise in the audio band if the input is properly dithered.
However, the noise reduction is only [log2 64]
× 3 dB = 18 dB.)
PIN 1
0.580 (14.73)
0.485 (12.32)
1
14
15
2
8
0.625 (15.87)
0.600 (15.24)
0.015 (0.381)
0.008 (0.204)
0.195 (4.95)
0.125 (3.18)
0.250
(6.35)
MAX
0.022 (0.558)
0.014 (0.356)
0.100
(2.54)
BSC
0.200 (5.05)
0.125 (3.18)
0.070 (1.77)
MAX
0.060 (1.52)
0.015 (0.38)
0.150
(3.81)
MIN
SEATING
PLANE
1.565 (39.70)
1.380 (35.10)
Figure 1. AD1878/AD1879 Modulator Noise-Shaper (One
Channel)


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