米6体育平台手机版

ZHCSFJ3A July 2014 – September 2016 ADS1148-Q1

PRODUCTION DATA.

封装选项

机械数据 (封装 | 引脚)

PW|28
- MPDS364

散热焊盘机械数据 (封装 | 引脚)

订购信息

7 Parameter Measurement Information

7.1 Noise Performance

The ADC noise performance is optimized by adjusting the data rate and PGA setting. Generally, the lowest input-referred noise is achieved using the highest gain possible, consistent with the input signal range. Do not set the gain too high or the result is an ADC overrange. Noise also depends on the output data rate. When the data rate reduces, the ADC bandwidth correspondingly reduces. This reduction in total bandwidth results in lower overall noise. Table 1 and Table 2 summarize the noise performance of the device. The data are representative of typical noise performance at T_A = 25°C. The data shown are the result of averaging the readings from multiple devices and were measured with the inputs shorted together.

Table 1 lists the input-referred noise in units of µV_PP for the conditions shown. Table 2 lists the corresponding data in units of effective number of bits (ENOB), where ENOB for the peak-to-peak noise is defined in Equation 1.

Equation 1. ENOB = ln((2 × V_REF / Gain) / V_NPP) / ln(2)

where

V_NPP is the input-referred peak-to-peak noise voltage

Table 1. Noise in µV_PP
At V_REF = 2.048 V, AVDD = 5 V, AVSS = 0 V

DATA RATE (SPS)	PGA SETTING
DATA RATE (SPS)	1	2	4	8	16	32	64	128
5	62.5⁽¹⁾	31.25⁽¹⁾	15.63⁽¹⁾	7.81⁽¹⁾	3.91⁽¹⁾	1.95⁽¹⁾	0.98⁽¹⁾	0.49⁽¹⁾
10	62.5⁽¹⁾	31.25⁽¹⁾	15.63⁽¹⁾	7.81⁽¹⁾	3.91⁽¹⁾	1.95⁽¹⁾	0.98⁽¹⁾	0.49⁽¹⁾
20	62.5⁽¹⁾	31.25⁽¹⁾	15.63⁽¹⁾	7.81⁽¹⁾	3.91⁽¹⁾	1.95⁽¹⁾	0.98⁽¹⁾	0.55
40	62.5⁽¹⁾	31.25⁽¹⁾	15.63⁽¹⁾	7.81⁽¹⁾	3.91⁽¹⁾	1.95⁽¹⁾	0.98⁽¹⁾	0.75
80	62.5⁽¹⁾	31.25⁽¹⁾	15.63⁽¹⁾	7.81⁽¹⁾	3.91⁽¹⁾	1.95⁽¹⁾	1.09	0.98
160	62.5⁽¹⁾	31.25⁽¹⁾	15.63⁽¹⁾	7.81⁽¹⁾	3.91⁽¹⁾	1.95⁽¹⁾	1.88	1.57
320	62.5⁽¹⁾	35.3	17.52	8.86	4.35	3.03	2.44	2.34
640	93.06	45.2	18.73	12.97	6.51	4.2	3.69	3.5
1000	284.59	129.77	61.3	33.04	16.82	9.08	5.42	4.65
2000	273.39	130.68	67.13	36.16	19.22	9.87	6.93	6.48

(1) Peak-to-peak noise rounded up to 1 LSB.

Table 2. Effective Number of Bits From Peak-to-Peak Noise
At V_REF = 2.048 V, AVDD = 5 V, AVSS = 0 V

DATA RATE (SPS)	PGA SETTING
DATA RATE (SPS)	1	2	4	8	16	32	64	128
5	16	16	16	16	16	16	16	16
10	16	16	16	16	16	16	16	16
20	16	16	16	16	16	16	16	15.8
40	16	16	16	16	16	16	16	15.4
80	16	16	16	16	16	16	15.8	15
160	16	16	16	16	16	16	15.1	14.3
320	16	15.8	15.8	15.8	15.8	15.4	14.7	13.7
640	15.4	15.5	15.7	15.3	15.3	14.9	14.1	13.2
1000	13.8	13.9	14	13.9	13.9	13.8	13.5	12.7
2000	13.9	13.9	13.9	13.8	13.7	13.7	13.2	12.3